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    Wyświetlanie 1-44 z 44
    Tytuł:
    Cd(Mg)Se Single Layers and CdSe/CdMgSe Heterostructures Grown by Molecular Beam Epitaxy on InAs(001) Substrates
    Autorzy:
    Kaygorodov, V. A.
    Sorokin, V. S.
    Sedova, I. V.
    Nekrutkina, O. V.
    Sorokin, S. V.
    Shubina, T. V.
    Toropov, A. A.
    Ivanov, S. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028799.pdf
    Data publikacji:
    2001-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    Opis:
    We report on molecular beam epitaxy of CdSe/CdMgSe heterostructures on InAs(001) substrates and studies of their optical and structural properties. The CdMgSe energy gap versus composition dependence is determined. The zinc-blende MgSe band-gap energy and optical bowing parameter are estimated to be 4.05 eV and 0.2 eV, respectively. The CdSe quantum wells embedded into CdMgSe barriers demonstrate intense photoluminescence. Effective mass approximation calculations of electron-heavy hole optical transitions in CdSe quantum well are in a good agreement with the experimental data obtained.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 3; 443-450
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton States in Type-II ZnSe/BeTe Quantum Wells
    Autorzy:
    Platonov, A. V.
    Yakovlev, D. R.
    Zehnder, U.
    Kochereshko, V. P.
    Ossau, W.
    Fischer, F.
    Litz, Th.
    Waag, A.
    Landwehr, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968413.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ls
    78.66.Hf
    Opis:
    We present an optical investigation of novel heterostructures based on beryllium chalcogenides with a type-I and type-II band alignment. In the type-II quantum well structures (ZnSe/BeTe) we observed a strong exciton transition involving an electron confined in the conduction band well and a hole localized in the valence band barrier (both in ZnSe layer). This transition is drastically broadened by the temperature increase due to enhanced exciton-acoustic phonon interaction.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 953-957
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optically Pumped Low Threshold ZnSe Based Lasers with 2.8 ML CdSe Active Region
    Autorzy:
    Sorokin, S.
    Toropov, A.
    Shubina, T.
    Lebedev, A.
    Sedova, I.
    Ivanov, S.
    Waag, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992195.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    78.45.+h
    Opis:
    Room-temperature optically pumped (Zn,Mg)(S,Se)/(Zn,Cd)Se laser structures have been grown by molecular beam epitaxy. Using of alternatively-strained short-period superlattice waveguide results in low threshold power density values over the whole blue-green (470-520 nm) wavelength range. Incorporation of CdSe fractional monolayer active region provides more than fourfold further decrease in threshold with respect to quantum well laser structure. Optical and structural properties of laser structure with 2.8 monolayer CdSe are discussed in detail.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 539-544
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Half-Parabolic Quantum Wells of Diluted Magnetic Semiconductor Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te
    Autorzy:
    Kutrowski, M.
    Wojtowicz, T.
    Cywiński, G.
    Karczewski, G.
    Janik, E.
    Dynowska, E.
    Kossut, J.
    Kossacki, P.
    Fiederling, R.
    Pfeuffer-Jeschke, A.
    Ossau, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968307.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    78.66.Hf
    Opis:
    We report on magnetooptical studies of MBE-grown half-parabolic CdTe/Cd$\text{}_{x}$Mn$\text{}_{1-x}$Te quantum well structures. The value of the valence band offset Q$\text{}_{v}$=0.4 ± 0.05 was determined by comparing energies of optical transitions in the absence of a magnetic field with model calculations. This value was verified by fitting the observed spin splitting of the lowest heavy hole (hh) state. We discuss also the temperature dependence of Q$\text{}_{v}$.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 887-890
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and electrical properties of highly doped ZnO:Al films deposited by atomic layer deposition on Si substrates in visible and near infrared region
    Autorzy:
    Romanyuk, V.
    Dmitruk, N.
    Karpyna, V.
    Lashkarev, G.
    Popovych, V.
    Dranchuk, M.
    Pietruszka, R.
    Godlewski, M.
    Dovbeshko, G.
    Timofeeva, I.
    Kondratenko, O.
    Taborska,, M.
    Ievtushenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1156366.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    73.61.Ga
    Opis:
    Optical properties of ZnO films doped by Al in the range 0.5 to 7 at.% and deposited by atomic layer deposition were studied in visible and infrared spectral range. Spectral dependences of film optical permittivity were modeled with the Lorentz-Drude approximation resulting in ZnO:Al plasma frequency and plasma damping parameters. We observed changing electron effective mass from 0.29m₀ to 0.5m₀ with increasing electron concentration in the range (0.9-4) × 10²⁰ due to the phenomenon of conduction band non-parabolicity. Comparing the results of optical and electrical investigations we can see that the main scattering mechanism is the scattering on grain boundaries (its contribution is about 60%).
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-36-A-40
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Optical Studies of CdTe/ZnTe Superlattices with Ultrathin ZnTe Layers
    Autorzy:
    Mariette, H.
    Jouneau, P. H
    Pelekanos, N. T.
    Tardot, A.
    Feuilet, G.
    Magnea, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929608.pdf
    Data publikacji:
    1993-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    73.61.Ga
    Opis:
    Spatially selective introduction of ultrathin ZnTe layers (1 to 3 mono-layers) into CdTe allows the study of special superlattice structure, corresponding to a monomolecular plane-host crystal system. Particular attention is given to the strain state control of the inserted ZnTe monolayer. High resolution electron microscopy is used to measure the local lattice distortion: the method yields the location and the total amount of Zn per period, and the results are compared with X-ray diffraction data. Optical properties of these superlattices are also presented. All results show the ability to control ultrathin pseudomorphic layers of ZnTc within CdTe, with limited Zn segregation, and of high crystalline and optical quality. In addition, they can be fitted within the framework of elasticity theory for the structural data, and of a finite quantum well model for the optical ones, even in the ultimate limit of only one nominal ZnTe monolayer.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 3; 423-433
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    δ-Doped CdTe/Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Multiple Quantum Wells Investigated by Photoreflectance Spectroscopy
    Autorzy:
    Sitarek, P.
    Misiewicz, J.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933972.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Vv
    78.66.Hf
    Opis:
    Room temperature photoreflectance spectroscopy was used to investigate CdTe/Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te multiple quantum wells grown by MBE. Structures were indium δ-doped into the well or into the barrier. The value of heavy and light hole subbands splitting was measured and compared to the calculated ones. The influence of the position of δ-doping on the measured spectra was shown.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 901-904
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Related Electronic States on CdTe(110) Observed by Means of Optical Spectroscopy
    Autorzy:
    Kowalski, B. J.
    Orłowski, B. A.
    Cricenti, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934063.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.-r
    78.66.Hf
    Opis:
    Surface differential reflectivity together with photoemission and Auger electron spectroscopies have been applied to observe and identify optical transitions among surface related states on CdTe(110) surfaces. The strongest contributions to the band of optical transitions have been revealed at the photon energies of 2.8, 3.4, and 3.9 eV. Their correspondence to excitations from the occupied S1 band to the unoccupied U1 one at the Γ, Χ and Χ' points of the surface Brillouin zone is discussed.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 1005-1009
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Zn:Se Ratio on the Properties of Sprayed ZnSe Thin Films
    Autorzy:
    Öztaş, M.
    Bedir, M.
    Bakkaloğlu, Ö.
    Ormancı, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042122.pdf
    Data publikacji:
    2005-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    73.50.Pz
    Opis:
    The effect of Zn:Se ratio on the photoconducting properties of ZnSe thin films has been studied. The ZnSe thin films have been deposited onto glass substrates by the spray pyrolysis method, the substrate temperature kept at 430ºC using mixed aqueous solutions of ZnCl$\text{}_{2}$ and SeO$\text{}_{2}$ with different Zn:Se ratios. Their electrical, structural, and photoconductivity properties have been studied. The values of optical bandgap have been determined from the absorption spectra.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 3; 525-534
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se Epilayers Studied by Spectroscopy Methods
    Autorzy:
    Głowacki, G.
    Gapiński, A.
    Derkowska, B.
    Bała, W.
    Sahraoui, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969076.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.-w
    78.20.Jq
    78.66.Hf
    Opis:
    Linear optical properties of the Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se (0 ≤ x ≤ 0.4) alloys have been studied using reflectance, spectroscopic ellipsometry and photoluminescence measurements. The refractive indices of Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se epilayers were investigated as a function of Mg composition (0 ≤ x ≤ 0.4). The energies of band gap E$\text{}_{g}$ and spin-orbit splitting E$\text{}_{g}$+Δ, have been determined. These energies are shifted gradually to higher values with increasing Mg content.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 321-325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Anisotropy of ZnSe/BeTe Superlattices Probed by Excitonic Spectroscopy
    Autorzy:
    Platonov, A. V.
    Kochereshko, V. P.
    Ivchenko, E. L.
    Yakovlev, D.
    Ossau, W.
    Fischer, F.
    Waag, A.
    Landwehr, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992063.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.66.-w
    78.66.Hf
    Opis:
    Photoluminescence spectra of type-II ZnSe/BeTe superlattices were studied. A linear polarised photoluminescence has been found in the spectral range of spatially indirect exciton transitions. This observation is interpreted in a model of optical anisotropy of heterostructures with no-common atom at interfaces.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 479-482
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Magneto-Optical Study on Single Quantum Wells, Cd$\text{}_{1-x}$Zn$\text{}_{x}$Te/Cd$\text{}_{1-x'-y}$Zn$\text{}_{x}$'Mn$\text{}_{y}$Te
    Autorzy:
    Takeyama, S.
    Grabecki, G.
    Adachi, S.
    Takagi, Y.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934045.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.-m
    78.20.Ls
    78.66.Hf
    Opis:
    Four-single quantum wells composed of the ternary non-magnetic compounds Cd$\text{}_{0.93}$Zn$\text{}_{0.07}$Te (well width = 13, 19, 40, 90 Å), separated by the quaternary magnetic-compound Cd$\text{}_{0.48}$Zn$\text{}_{0.04}$Mn$\text{}_{0.48}$Te on (100)GaAs substrate were grown by MBE, and exhibited clear and distinctive photoluminescence lines corresponding to each quantum well. Double luminescence peaks with closely spaced within one well were observed from 90 Å and 40 Å quantum wells. Temperature and magnetic-field study revealed characteristic luminescence features associated with a bound exciton near the interface rather than with one monolayer fluctuation.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 945-948
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se Layers Obtained by Thermal Diffusion of Mg into ZnSe and Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se Epilayers Grown by Molecular Beam Epitaxy
    Autorzy:
    Bała, W.
    Firszt, F.
    Głowacki, G.
    Gapiński, A.
    Dzik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931931.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.20.Ci
    78.66.Hf
    Opis:
    This work deals with the study of photoluminescence properties of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se epilayers grown by molecular beam epitaxy on (001) GaAs and (111) ZnTe substrates and Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se layers obtained by thermal diffusion of Mg into ZnSe single crystals. Luminescence spectra of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se layers are dominated by blue and violet emission bands with maxima positioned in the range of photon energies: 3.05-3.28 eV, 2.88-3.04 eV, 2.81 eV and 2.705 eV, depending on preparation conditions. In some samples the blue luminescence is observed up to room temperature.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 161-164
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Study of an Asymmetric Double Quantum Well System: CdTe/CdMnTe
    Autorzy:
    Lawrence, I.
    Feuilet, G.
    Tuffigo, H.
    Bodin, C.
    Cibert, J.
    Rühle, W. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1861487.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    78.20.Ls
    78.47.+p
    Opis:
    Carrier tunneling through CdMnTe barriers of different thicknesses is investigated in CdTe/CdMnTe asymmetric double quantum wells. Steady-state photoluminescence at 1.8 K and time-resolved photoluminescence experiments between 10 K and 50 K were performed.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 637-640
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence Decay in Deep Quantum Wells CdTe/Cd_{0.5}Mn_{0.5}Te at Room Temperature
    Autorzy:
    Kowalczyk, L.
    Fancey, S.
    Buller, G.
    Massa, J.
    Kutrowski, M.
    Janik, E.
    Karczewski, G.
    Wojtowicz, T.
    Zakrzewski, A.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1876908.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    78.47.+p
    78.55.Et
    Opis:
    Time-resolved photoluminescence was used to study exciton recombination in deep CdTe/Cd_{0.5}Mn_{0.5}Te single quantum well. The width of the investigated well was 100 A. The study was performed at room temperature. The lifetime of the exciton determined in this work has a value comparable to that observed in shallow CdTe/Cd_{0.85}Mn_{0.15}Te quantum wells. A strong enhancement of the photoluminescence decay time with increasing intensity of the exciting laser beam is observed which is indicative of saturation of the non-radiative recombination centers.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 508-513
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scanning Tunneling Spectroscopy and Luminescent Properties of ZnS:Mn,Cu,Cl Thin Films
    Autorzy:
    Neunert, G.
    Kamiński, M.
    Susła, B.
    Dunaj, T.
    Chimczak, E.
    Bertrandt-Żytkowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036945.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Fi
    78.66.Hf
    68.37.Ef
    Opis:
    Electrical and luminescent properties of ZnS:Mn,Cu,Cl thin films were investigated. Combined both studies: scanning tunneling microscopy and scanning tunneling spectroscopy were made. The current and differential conductance versus applied voltage were measured for the ZnS:Mn,Cu,Cl thin films. Additionally, the spectral and kinetic properties of the electroluminescent cells based on the ZnS:Mn,Cu,Cl thin films were measured. The maximum of the electroluminescence lies at 586 nm. The electroluminescence was excited by rectangular wave voltage pulses with pulse length from 1μs to 1 ms. It was shown that time dependence of the electroluminescence is well explained assuming energy transfer between monomolecular centres.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 3-4; 357-363
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extra-Low Temperature Growth of ZnO by Atomic Layer Deposition with Diethylzinc Precursor
    Autorzy:
    Kowalik, I. A.
    Guziewicz, E.
    Kopalko, K.
    Yatsunenko, S.
    Godlewski, M.
    Wójcik, A.
    Osinniy, V.
    Krajewski, T.
    Story, T.
    Łusakowska, E.
    Paszkowicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047710.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.66.Hf
    81.15.Kk
    Opis:
    ZnO thin films were grown on silicon substrate by atomic layer deposition method. We explored double-exchange chemical reaction and used very volatile and reactive diethylzinc as a zinc precursor. These enables us to obtain zinc oxide thin films of high quality at extremely low growth temperature (90-200ºC). The films are polycrystalline as was determined by X-ray diffraction and show flat surfaces with roughness of 1-4 nm as derived from atomic force microscopy measurements. Photoluminescence studies show that an edge emission of excitonic origin is observed even at room temperature for all investigated ZnO layers deposited with the diethylzinc precursor.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 401-406
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of Exciton Linewidth on the Composition of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se Layers Grown by MBE
    Autorzy:
    Bała, W.
    Głowacki, G.
    Gapiński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933707.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Εt
    78.20.Ci
    78.66.Hf
    Opis:
    This work deals with the study of the photoluminescence and reflectivity properties of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se epilayers grown by molecular beam epitaxy on (001)GaAs and (111)ZnTe substrates. The photoluminescence spectra of Zn$\text{}_{x}$Mg$\text{}_{1-x}$Se layers grown on GaAs and ZnTe substrates are dominated by blue emission bands. The energetical positions and relative intensities of the bands depend on Mg contents in the epilayers. The shift of the maxima of blue emission toward higher photon energies and a simultaneous steep increase in the linewidth with an increase in Mg concentration are observed. A small amount of Mg added to ZnSe leads to a sharp increase in the linewidth from 2 meV in pure ZnSe layer grown on GaAs substrate to about 180 meV in Zn$\text{}_{0.78}$Μg$\text{}_{0.22}$Se.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 667-670
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Characterization of Indium-Doped Zinc Oxide Thin Films Prepared by Sol-Gel Method
    Autorzy:
    Kim, M.
    Yim, K.
    Kim, S.
    Nam, G.
    Lee, D.
    Kim, Jin
    Kim, Jong
    Leem, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491351.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.20.Fw
    78.66.Hf
    Opis:
    Indium-doped ZnO thin films were deposited by sol-gel spin-coating method with various In content. The effects of In content on the structural and optical properties of the indium-doped ZnO thin films were investigated by scanning electron microscopy, X-ray diffraction, and UV-visible spectroscopy. The particle-like surface morphology and the crystallinity of the indium-doped ZnO thin films were affected by change in the In content, especially at the In content of 3 at.%. The values of direct band gap were decreased with increase in the In content. The width of localized states in the optical band gap of the indium-doped ZnO thin films were changed with In content and the Urbach energy $(E_{U})$ was changed inversely with optical band gap of the indium-doped ZnO thin films.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 217-220
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure Dependent Conductivity of Ultrathin ZnO Films
    Autorzy:
    Snigurenko, D.
    Kopalko, K.
    Krajewski, T.
    Łuka, G.
    Gierałtowska, S.
    Witkowski, B.
    Godlewski, M.
    Dybko, K.
    Paszkowicz, W.
    Guziewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403646.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Ga
    78.66.Hf
    81.15.Gh
    Opis:
    Zinc oxide films dedicated for hybrid organic/inorganic devices have been studied. The films were grown at low temperature (100°C, 130C and 200°C) required for deposition on thermally unstable organic substrates. ZnO layers were obtained in atomic layer deposition processes with very short purging times in order to shift a structure of the films from polycrystalline towards amorphous one. The correlation between atomic layer deposition growth parameters, a structural quality and electrical properties of ZnO films was determined.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1042-1044
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ZnO by ALD - Advantages of the Material Grown at Low Temperature
    Autorzy:
    Guziewicz, E.
    Godlewski, M.
    Krajewski, T.
    Wachnicki, Ł.
    Łuka, G.
    Paszkowicz, W.
    Domagała, J.
    Przeździecka, E.
    Łusakowska, E.
    Witkowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791286.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Ga
    78.66.Hf
    72.80.Ey
    Opis:
    The 3D-architecture is a prospective way in miniaturization of electronic devices. However, this approach can be realized only if metal paths are placed not only at the top, but also beneath the electronic parts, which imposes drastic temperature limitations for the electronic device processing. Therefore last years a lot of investigations are focused on materials which can be grown at low temperature with electrical parameters appropriate for electronic applications. Zinc oxide grown by the atomic layer deposition method is one of the materials of choice. We obtained ZnO-ALD films at growth temperature range between 100°C and 200°C, and with controllable electrical parameters. Free carrier concentration was found to scale with deposition temperature, so it is possible to grow ZnO films with desired conductivity without any intentional doping. We used correlation of electrical and optical parameters to optimize the deposition process. Zinc oxide layers obtained in that way have free carrier concentration as low as $10^{16} cm^{-3}$ and high mobility ($10-50 cm^{2}$/(Vs)), which satisfies requirements for a material used in three-dimensional memories.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 814-817
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Binding of Biexcitons in GaAs/AlGaAs Superlattices
    Autorzy:
    Mizeikis, V.
    Birkedal, D.
    Langbein, W.
    Lyssenko, V. G.
    Hvam, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968406.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Md
    71.35.Cc
    78.66.Hf
    Opis:
    Binding of the heavy-hole excitons and biexcitons in GaAs/Al$\text{}_{0.3}$Ga$\text{}_{0.7}$As superlattices is studied using linear and nonlinear optical techniques. High biexciton binding energies characteristic of quasi two-dimensional biexcitons are observed in superlattices with considerable miniband dispersion.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 923-928
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Dynamics in ZnTe Based Semimagnetic Semiconductors and CdMnTe Quantum Wells
    Autorzy:
    The Khoi, Nguyen
    Gaj, J.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Demianiuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952068.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    78.66.Hf
    73.20.Dx
    Opis:
    Inelastic scattering of excitons on LO phonons in ZnTe based bulk semimagnetic semiconductors with low concentration of paramagnetic ions (Mn$\text{}^{2+}$, Fe$\text{}^{2+}$ and Cr$\text{}^{2+}$) was studied. A polarization degree of the LO phonon Raman lines was measured as a function of the exciton splitting in a magnetic field, and allowed us to determine the polarization lifetime (polariton flight time). A similar method was used to investigate multiple Mn$\text{}^{2+}$ spin-flip scattering in CdMnTe quantum well. The cascade model seems to be not adequate to interpret the dependence of the polarization degree on the order of scattering.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 899-902
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Magnetic Polarons to Ferromagnetism
    Autorzy:
    Dietl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968985.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    75.70.Cn
    78.55.Et
    78.66.Hf
    Opis:
    A brief overview is given on selected effects of the exchange coupling between effective mass electrons and localized spins in II-VI semiconductors containing Mn ions. In the case of a carrier or exciton trapped by an impurity or defect, the exchange interaction leads to zero-field spin-splitting. The current theory of such complexes, known as bound magnetic polarons, describes correctly their spectroscopic and thermodynamic properties as well as their formation dynamics. At the same time, a free magnetic polaron - a delocalized carrier accompanied by a traveling cloud of polarized spins - is not expected to exist for the actual values of the coupling constants. However, hole scattering by thermodynamic and static fluctuations is shown to affect significantly its energy. For a strong coupling, the corresponding renormalization has to be described by a non-perturbative approach. Finally, the influence of the carrier liquid upon the Mn spins is discussed. Here, either optical pumping or p-type doping may lead to a ferromagnetic order, both in bulk and layered structures. Because of a long-range character of the carrier mediated interactions, this ordering is not destroyed by the fluctuations, even in the reduced dimensionality systems.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 111-123
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Prosperities of Ag-ZnO Composition Nanofilm Synthesized by Chemical Bath Deposition
    Autorzy:
    Wang, Y.
    Yao, J.
    Jia, G.
    Lei, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505423.pdf
    Data publikacji:
    2011-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Lm
    78.66.Hf
    78.55.Et
    68.37.Hk
    Opis:
    Ag-ZnO composite thin films were prepared on glass substrates by chemical bath deposition at lower temperature. The samples were characterized by X-ray diffraction, scanning electron microscopy, photoluminescence and the optical transmission spectra. The morphology analysis showed that Ag nanoparticles were not deposited on the ZnO nanorods surface but on the glass substrate. The influence of the reaction time on the size and density of Ag nanoparticles was studied, the results showed that the reaction time played an important role in determining of the optical characteristics. There were two obvious photoluminescence peaks located at about 395 nm and 471 nm, respectively. The blue emission centered at 471 nm can be ascribed to the electron transition from $Zn_{i}$ to $V_{Zn}$.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 3; 451-454
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microscopic Luminescence Properties of ZnO and ZnO Based Heterostructures
    Autorzy:
    Bertram, F.
    Christen, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046894.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Hk
    78.66.Hf
    81.05.Dz
    81.15.Gh
    Opis:
    The optical properties of excitonic recombinations in ZnO are investigated by spatially and spectrally resolved cathodoluminescence measurements. The relevance of cathodoluminescence microscopy as a spatially resolved luminescence technique as a simple but very powerful characterization method is stressed out in discussions of a wide variety of appropriate examples. A thorough discussion of the various features of the cathodoluminescence of an undoped ZnO bulk crystal, epitaxially grown ZnO and MgZnO/ZnO/MgZnO quantum well structure is given. Particular attention is devoted to the impact of the internal electrical fields, e.g. the Franz-Keldysh effect in ZnO. Furthermore, this study focuses on the spectral variations as a function of depth to the interface in ZnO homo- and heterostructures. Our aim is to establish the nature of the optical transitions influenced by internal fields, defects and impurity doping in ZnO/GaN and ZnO/ZnO interfaces. This review covers also the vertical transport, diffusion and capture of carriers in a MgZnO/ZnO/MgZnO quantum well structure.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 103-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excitonic Effects in Linear and Photoinduced Faraday Rotation in Semimagnetic Semiconductors
    Autorzy:
    Leisching, P.
    Pankoke, R.
    Buss, C.
    Frey, R.
    Flytzanis, C.
    Cibert, J.
    Wasiela, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968336.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    75.30.Et
    78.20.Ls
    78.66.Hf
    Opis:
    We investigate the influence of the Coulomb interaction on the giant linear and photoinduced Faraday rotation in the bulk Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te system. Experimental results are presented and discussed by calculating the complex dielectric function. The anisotropy and k-dependence of the magnetic spin-exchange interaction and the Coulomb interaction between optically excited bound and unbound electron-hole pairs are considered using a microscopic theory. At high excitation densities, the excitonic nonlinearities of the 1s transitions are investigated.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 895-898
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Trions in II-VI Heterostructures
    Autorzy:
    Cox, R. T.
    Huard, V.
    Kheng, K.
    Lovisa, S.
    Miller, R. B.
    Saminadayar, K.
    Arnoult, A.
    Cibert, J.
    Tatarenko, S.
    Potemski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968984.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    78.66.Hf
    71.35.Ji
    78.20.Ls
    Opis:
    Optical spectra associated with transitions that create or annihilate charged excitons X$\text{}^{-}$ or X$\text{}^{+}$ can be observed in quantum well heterostructures containing an electron gas or a hole gas, respectively. A review is given of properties of trion states in CdTe quantum wells in zero field and of the magnetic field-dependence of the circular polarization and oscillator strength of the trion optical resonance. The possibility that disorder is needed to stabilise trion states in concentrated 2D electron or hole systems is discussed.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 99-109
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Toward Better Light-Confinement in Micropillar Cavities
    Autorzy:
    Ściesiek, M.
    Gietka, K.
    Golnik, A.
    Kossacki, P.
    Jakubczyk, T.
    Pacuski, W.
    Kruse, C.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492873.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Pt
    42.70.Qs
    42.79.Fm
    78.66.Hf
    Opis:
    We report on a two-step etching of ZnTe based micropillars. We demonstrate applicability of the technology and we analyze the optical properties of obtained structures. Microphotoluminescence spectra of individual micropillars show a typical mode pattern that confirms a successful growth of photonic structures. The reflectivity and photoluminescence spectra of a planar microcavity measured for various incident angles show that additional side distributed Bragg reflectors will be important for the further enhancement of photon confinement in micropillar cavity.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 877-879
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    (Zn,Cu)O Films by Atomic Layer Deposition - Structural, Optical and Electric Properties
    Autorzy:
    Łukasiewicz, M.
    Witkowski, B.
    Wachnicki, Ł.
    Kopalko, K.
    Gierałtowska, S.
    Wittlin, A.
    Jaworski, M.
    Guziewicz, E.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492571.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    ZnCuO thin films have been deposited on silicon, glass and quartz substrates by atomic layer deposition method, using reactive organic precursors of zinc and copper. As zinc and copper precursors we applied diethylzinc and copper(II) acetyloacetonate. Structural, electrical and optical properties of the obtained ZnCuO layers are discussed based on the results of scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, atomic force microscopy, the Hall effect and photoluminescence investigations.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-034-A-036
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave Techniques Investigations of ZnCoO Films Grown by Atomic Layer Deposition
    Autorzy:
    Łukasiewicz, M.
    Cabaj, A.
    Godlewski, M.
    Guziewicz, E.
    Wittlin, A.
    Jaworski, M.
    Wołoś, A.
    Wilamowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492931.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    Electrical and magnetic properties of ZnCoO thin films grown on silicon substrates by atomic layer deposition method are investigated. The films were grown using reactive organic precursors of zinc and cobalt. The use of these precursors allowed us the significant reduction of a growth temperature to 200°C and below, which proved to be very important for the growth of uniform films of ZnCoO. We have measured the microwave AC conductivity and EPR for two types of ZnCoO samples, with different Co fractions.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 911-913
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Preparation Technique on the Properties of In:CdS Thin Films
    Autorzy:
    Dhanam, M.
    Kavitha, B.
    Maheswari, B.
    Jesna, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505169.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.-z
    78.66.Hf
    61.05.cp
    68.37.-d
    Opis:
    This paper presents the results of the structural, morphological and optical analysis of In:CdS thin films prepared by chemical bath deposition and successive ionic layer adsorption and reaction techniques. X-ray diffraction patterns showed the hexagonal phase of cadmium sulfide and it has been found that the amount of atomic percentage of indium increases the intensity of the preferential orientation (002) plane in chemical bath deposition In:CdS thin films. Compositional analysis confirmed the replacement of Cd ions by In ions and morphological analysis confirmed the lesser grain size and dense morphology in chemical bath deposition In:CdS thin films. Increase in In concentration in successive ionic layer adsorption and reaction In:CdS thin films leads to an increase in the optical transmission up to 80% and the higher band gap and therefore the results of this investigation enabled to understand the significance of preparation technique.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 885-889
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ZnCoO Films by Atomic Layer Deposition - Influence of a Growth Temperature οn Uniformity of Cobalt Distribution
    Autorzy:
    Łukasiewicz, M.
    Witkowski, B.
    Godlewski, M.
    Guziewicz, E.
    Sawicki, M.
    Paszkowicz, W.
    Łusakowska, E.
    Jakieła, R.
    Krajewski, T.
    Kowalik, I.
    Kowalski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791350.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    We report on the structural, electrical and magnetic properties of ZnCoO thin films grown by atomic layer deposition method using reactive organic precursors of zinc and cobalt. As a zinc precursor we applied either dimethylzinc or diethylzinc and cobalt(II) acetyloacetonate as a cobalt precursor. The use of these precursors allowed us the significant reduction of a growth temperature to 300°C and below, which proved to be very important for the growth of uniform films of ZnCoO. Structural, electrical and magnetic properties of the obtained ZnCoO layers will be discussed based on the results of secondary ion mass spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, atomic force microscopy, Hall effect and SQUID investigations.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 921-923
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Thermal Process on Physical Properties of ZnO Films Prepared by Spray Pyrolysis
    Autorzy:
    Gencyilmaz, O.
    Atay, F.
    Akyuz, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1377852.pdf
    Data publikacji:
    2014-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    78.66.Hf
    73.61.Ga
    68.37.Ps
    Opis:
    ZnO films were deposited on glass substrates by ultrasonic spray pyrolysis technique at a substrate temperature of 300 ± 5°C. All of the films have been annealed at 500°C temperature for different time (1, 2, and 3 h) to improve the optical, electrical and surface properties. The effect of annealing time on the films of physical properties has been investigated. UV-Vis spectrophotometer has been used for transmittance measurements. Also, band gap values of the films have been determined by optical method. Atomic force microscopy has been used to have information the surface morphology and roughness values of the films. Thicknesses, refractive index and extinction coefficient values of the films have been determined by spectroscopic ellipsometry technique. The electrical conduction mechanisms and resistivity of the films were investigated using two probe technique. After all the investigations it was concluded that annealing time has a dramatic effect especially on the surface, optical properties and electrical resistivity values of ZnO films. From the results of these investigations, the application potential of the films for solar cell devices as transparent electrode was searched.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 6; 1331-1337
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ZnCoO Films Obtained at Low Temperature by Atomic Layer Deposition Using Organic Zinc and Cobalt Precursors
    Autorzy:
    Łukasiewicz, M.
    Wójcik-Głodowska, A.
    Guziewicz, E.
    Jakieła, R.
    Krajewski, T.
    Łusakowska, E.
    Paszkowicz, W.
    Minikayev, R.
    Kiecana, M.
    Sawicki, M.
    Godlewski, M.
    Wachnicki, Ł.
    Szczepanik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811957.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    In this paper we report on ZnCoO thin films grown by atomic layer deposition method in reactor F-120 Satellite. ZnCoO films were grown at low temperature ($T_s$=160°C) with a new zinc precursor (dimethylzinc - DMZn) and with cobalt (II) acetyloacetonate (Co(acac)₂) as a cobalt precursor and deionized water as an oxygen precursor. In this paper we concentrate on the methods of homogenizing Co distribution in ZnCoO films.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1235-1240
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Studies of Thermally Activated Vertical Hole Transport in ZnCdSe/ZnSSe Superlattice
    Autorzy:
    Lebedev, A.
    Sorokin, S.
    Toropov, A.
    Shubina, T.
    Il'inskaya, N.
    Nekrutkina, O.
    Ivanov, S.
    Pozina, G.
    Bergman, P.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991641.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    78.45.+h
    71.35.-y
    78.47.+p
    72.80.Ey
    Opis:
    Miniband transport in alternatively-strained ZnCdSe/ZnSSe short period superlattices is investigated using a structure with an enlarged quantum well. Temperature dependences of time-resolved and continuous wave photoluminescence have been measured, demonstrating an efficient temperature-induced vertical hole transport. A quantitative description is given for the carrier kinetics in these structures.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 421-426
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of ZnCoO Films and Nanopowders
    Autorzy:
    Wolska, E.
    Łukasiewicz, M.
    Fidelus, J.
    Łojkowski, W.
    Guziewicz, E.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791349.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    78.55.Et
    81.07.Wx
    61.72.uf
    78.66.Hf
    Opis:
    ZnCoO is one of the most studied and promising semiconductor materials for spintronics applications. In this work we discuss optical and electrical properties of ZnCoO films and nanoparticles grown at low temperature by either atomic layer deposition or by a microwave driven hydrothermal method. We report that doping with cobalt quenches a visible photoluminescence of ZnO. We could observe a visible photoluminescence of ZnO only for samples with very low Co fractions (up to 1%). Mechanisms of photoluminescence quenching in ZnCoO are discussed. We also found that ZnO films remained n-type conductive after doping with Co, indicating that a high electron concentration and cobalt 2+ charge state can coexist.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 918-920
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Ions in Studies of Semiconductor Quantum Well Structures
    Autorzy:
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968988.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    78.30.Fs
    78.66.Hf
    71.35.Cc
    71.35.Ji
    Opis:
    A few aspects of a relation between magnetic properties of Mn ion system and electronic states confined in CdTe based quantum wells are discussed. It is shown that the influence of the magnetic fluctuations on the states confined in the quantum well results in the reduction of the relative valence band offset with temperature. Also the decrease in the effective Zeeman splitting is observed by a modulation technique at high temperatures and is explained in terms of the modification of the selection rules for an exciton localised in thermal fluctuations. For the p-doped samples the giant Zeeman splitting is used to tune the polarization of a hole gas by a small magnetic field. The "competition-like" relation between the oscillator strength of exciton (X) and positive trion (X$\text{}^{+}$) is proved experimentally.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 147-154
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Structural Properties of Bismuth Doped ZnO Thin Films by Sol-Gel Method: Urbach Rule as a Function of Crystal Defects
    Autorzy:
    Keskenler, E.
    Aydın, S.
    Turgut, G.
    Doğan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205375.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    78.66.Hf
    78.40.Fy
    78.66.Jg
    68.37.Yz
    68.55.ag
    68.60.Bs
    Opis:
    Bismuth (Bi) doped zinc oxide (ZnO:Bi) thin films were prepared on glass substrates by sol-gel spin coating technique using homogeneous precursor solutions, and effects of Bi doping on the structural and optical properties of ZnO were investigated. The crystalline of ZnO films shifted from polycrystalline nature to amorphous nature with Bi doping. The plane stresses (σ) for hexagonal ZnO and ZnO:Bi crystals were calculated according to the biaxial strain model. The Urbach rule was studied as a function of non-thermal component to the disorder (defects in crystal structures) which is especially observed in the case of non-crystal semiconductors. The calculated Urbach energies and steepness parameters of undoped ZnO and ZnO:Bi films varied between 44.33 meV and 442.67 meV, and 58.3 × $10^{-2}$ and 5.8 × $10^{-2}$, respectively. The Urbach energies of the films increased with an increase in the Bi doping concentration and a great difference was observed for 7.0 mol.% doping. The band gap values of the films exhibited a fluctuated behavior as a result of doping effect.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 782-786
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First-Principles Calculations of Structural, Electronic, Optical, and Thermodynamic Properties of CdS, CdTe and Their Ternary Alloys $CdS_{1-x}Te_{x}$ (0.0 ≤ x ≤1.0)
    Autorzy:
    Ameri, M.
    Mesbah, S.
    Al-Douri, Y.
    Bouhafs, B.
    Varshney, D.
    Ameri, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1364167.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.E-
    63.20.dk
    04.25.-g
    78.66.Hf
    73.61.At
    Opis:
    Using first-principle method, we investigate the structural, electronic, optical, and thermodynamic properties of the $CdS_{1-x}Te_x$ semiconductor alloys using generalized gradient approximation for the exchange-correlation potential calculation. The ground state properties are determined for the bulk materials (CdS and CdTe) in cubic phase. Quantities such as the lattice constants and bulk modulus of interest are calculated. Detailed comparisons are made with published experimental and theoretical data and show generally good agreement. The calculated lattice constants scale linearly with composition (Vegard's law). The microscopic origins of the bowing parameter were explained using the contributions from volume deformation, charge transfer and structural relaxation approach. The refractive index and optical dielectric constant for the alloys of interest were calculated by using different models. In addition, the thermodynamic stability of the alloys was investigated by calculating the critical temperatures of alloys.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1110-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extension of Usable Spectral Range of Peltier Cooled Photodetectors
    Autorzy:
    Piotrowski, A.
    Piotrowski, J.
    Gawron, W.
    Pawluczyk, J.
    Pedzinska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807657.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.60.Gz
    82.80.Gk
    73.61.Ga
    78.66.Hf
    81.05.Dz
    Opis:
    This paper provides update on development of the Peltier cooled detectors optimized for wavelengths above 13 μm. Initially, the devices made by Vigo were mostly used for uncooled detection of $CO_{2}$ laser radiation. Over the years the performance and speed of response has been steadily improved. At present the uncooled or Peltier cooled photodetectors can be used for sensitive and fast response detection in the mid-wavelength and long-wavelength infrared spectral range. The devices have found important applications in IR spectrometry, quantum cascade laser based gas analyzers, laser radiation alerters and many other IR systems. Recent efforts were concentrated on the extension of useful spectral range to > 13 μm, as required for its application in Fourier transform IR spectrometers. This was achieved with improved design of the active elements, use of monolithic optical immersion technology, enhanced absorption of radiation, dedicated electronics, series connection of small cells in series, and last but not least, applying more efficient Peltier coolers. Practical devices are based on the complex HgCdTe heterostructures grown on GaAs substrates with metal-organic chemical vapor deposition technique with immersion lens formed by micromachining in the GaAs substrates. The results are very encouraging. The devices cooled with miniature 4 stage Peltier coolers mounted in TO-8 style housings show significant response at wavelength exceeding 16 μm.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-52-S-55
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monocrystalline and Polycrystalline ZnO and ZnMnO Films Grown by Atomic Layer Epitaxy - Growth and Characterization
    Autorzy:
    Wójcik, A.
    Kopalko, K.
    Godlewski, M.
    Łusakowska, E.
    Paszkowicz, W.
    Dybko, K.
    Domagała, J.
    Szczerbakow, A.
    Kamińska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038164.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    Recently we demonstrated growth of monocrystalline ZnO films by atomic layer epitaxy in the gas flow variant using inorganic precursors. In this study, we discuss properties of ZnO films grown with organic precursors. Successful Mn doping of the ZnO films during the growth was achieved using the Mn-thd complex. Secondary ion mass spectroscopy and X-ray investigations reveal the contents of Mn up to about 20% of the cationic component.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 667-673
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic, Structural, and Optical Properties of Low Temperature ZnMnO Grown by Atomic Layer Epitaxy
    Autorzy:
    Wójcik, A.
    Kiecana, M.
    Kopalko, K.
    Godlewski, M.
    Guziewicz, E.
    Yatsunenko, S.
    Łusakowska, E.
    Minikayev, R.
    Paszkowicz, W.
    Świątek, K.
    Wilamowski, Z.
    Sawicki, M.
    Dietl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044552.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    Magnetic, structural, and optical properties of ZnMnO films grown with atomic layer epitaxy are discussed. Atomic layer epitaxy films were grown at low temperature using organic zinc and manganese precursors. From magnetometry and electron spin resonance investigations we conclude that lowering of a growth temperature significantly limits formation of Mn precipitates and inclusions of different foreign phases of manganese oxides to ZnMnO host.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 915-921
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Terahertz Emission from Surfaces of Cu(InGa)Se_2 Layers
    Autorzy:
    Koroliov, A.
    Arlauskas, A.
    Balakauskas, S.
    Šoliūnas, M.
    Maneikis, A.
    Krotkus, A.
    Šetkus, A.
    Tamošiūnas, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399106.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Li
    88.40.jn
    77.55.hf
    Opis:
    In this contribution, we report on investigations of THz emission from $Cu(In,Ga)Se_2$ layers, deposited from a single copper-deficient sputtering target. Emission from $Cu(In,Ga)Se_2$ layer surface and from multilayer structure with transparent ZnO layers were studied. It was determined that additional undoped ZnO layer reduces the amplitude of THz emission, while additional n-type ZnO layers increase the emission amplitude again. This effect can be attributed to stronger electric field in the heterostructure between p-type $Cu(In,Ga)Se_2$ and n-type ZnO layers.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 846-848
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-44 z 44

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