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    Wyświetlanie 1-13 z 13
    Tytuł:
    Photovoltaic Effect on PbTe p-n Junction in the Presence of Magnetic Field
    Autorzy:
    Le Van, Khoi
    Grodzicka, E.
    Witkowska, B.
    Story, T.
    Gałązka, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929738.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    78.20.Ls
    72.80.Ga
    Opis:
    Photovoltaic spectra of PbTe p-n junction have been measured in the infrared spectral region in the temperature range of 8-260 K. The p-n junctions have been formed by cadmium diffusion into the p-type PbTe crystals. From the positions of the photovoltaic maxima the energy gap of the diode material has been determined. In the presence of a magnetic field up to 7 T, a pronounced oscillatory behavior of the photovoltage was observed in the Faraday and Voigt configurations. Experiments were performed as a function of the magnetic field intensity at a constant wavelength of the incident light. The energy of the interband magnetooptical transitions between the Landau levels in PbTe was determined and compared with the theoretical model of Adler, describing the energy band structure for the IV-VI compounds.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 721-724
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Luminescent Properties of ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ Heterojunction
    Autorzy:
    Le Van, Khoi
    Dobrowolski, W.
    Witkowska, B.
    Mycielski, A.
    Galązka, R. R.
    Nguyen, Khoi
    Powiązania:
    https://bibliotekanauki.pl/articles/1872527.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Fi
    Opis:
    ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions were prepared by vapor-transport epitaxy of ZnTe on In-doped Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ (x = 0.05, y = 0.03) single crystalline substrate in vacuum. At temperatures lower than 120 K the infrared and red electroluminescence were observed from the ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ diode with forward current density in the range 0.003-4.0 A/cm$\text{}^{2}$.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 325-328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resonant Photoemission Study of Mn 3d Electrons Contribution to the Pb$\text{}_{0.92}$Mn$\text{}_{0.08}$Se Valence Band
    Autorzy:
    Orłowski, B. A.
    Kowalski, B. J.
    Le Van, Khoi
    Gałązka, R. R.
    Ghijsen, J.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1872563.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Fi
    79.60.-i
    Opis:
    The resonant photoemission spectroscopy was applied to investigate the valence band electronic structure of semimagnetic semiconductor Pb$\text{}_{0.92}$Mn$\text{}_{0.08}$Se crystal and to determine the contribution of Mn 3d electrons to the valence band. The set of energy distribution curves and constant initial states spectra were taken for by energies in the region (40-60 eV) close to the Mn 3p-3d transition. The electrons Mn 3d hybridize and contribute to the valence band electrons of the crystal and main density of states contribution appears in the energy 3.5 ± 0.2 eV below the valence band edge.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 329-332
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bound Exciton Luminescence in Phosphorus Doped Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Crystals
    Autorzy:
    Van Khoi, Le
    Gałązka, R. R.
    Witkowska, B.
    The Khoi, Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/1991563.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    78.47.+p
    Opis:
    Measurement of photoluminescence as a function of temperature and of magnetic field in p-type phosphorus doped Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te is reported. From the conduction band-acceptor level transition, the ionization energy of P-acceptors is obtained to be 54ą1 meV. The photoluminescence spectrum in the band edge region exhibits three maxima connected with the recombination of excitons bound to neutral acceptors (A$\text{}^{0}$, X), excitons bound to neutral donors (D$\text{}^{0}$,X), and free excitons (X) at energies E$\text{}_{(A^{0},X)}$=1.606, E$\text{}_{(D^{0},X)}$=1.610, and E$\text{}_{X}$=1.614 eV, respectively. At T=1.4 K a strong increase in PL intensity of (A$\text{}^{0}$, X) line 8-fold as a function of magnetic field is found and shown to originate from the magnetic field-induced lowering of the acceptor binding energy and increase in the hole effective volume.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 392-396
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of (Zn,Mn)Te Semimagnetic Alloy Co-Doped with Chromium
    Autorzy:
    Avdonin, A.
    Van Khoi, Le
    Knoff, W.
    Gałązka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791420.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    75.50.Pp
    75.60.Ej
    Opis:
    Results of simultaneous doping of ZnTe with manganese and chromium are presented. An increase of magnetization of ferromagnetic Cr-related clusters with manganese concentration is observed. Phosphorus doping prevents the formation of ferromagnetic clusters.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 974-975
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photovoltaic Effect of ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ Heterojunctions in Presence of Magnetic Field
    Autorzy:
    Gałązka, R. R.
    Nguyen, The Khoi
    Khoi, Le Van
    Dobrowolski, W.
    Witkowska, B.
    Mycielski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933917.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    78.20.Ls
    72.80.Ga
    Opis:
    Photovoltaic effect of the ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions, prepared by vapor-transport epitaxy of ZnTe on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate was studied. The photovoltaic measurements were carried out over the temperature range from 12 K to 300 K and in the magnetic field up to 6 T. In the magnetic field, maximum of the sensitivity corresponding to the energy of the forbidden gap of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate splits into two components for σ$\text{}^{+}$ and σ¯ circular polarizations of incident light. This phenomenon was ascribed to the exchange interaction of the magnetic moments of Mn$\text{}^{++}$ ions with band electrons. From the value of the splitting energy the exchange integral N$\text{}_{0}$(α-β) was determined to be 1.15 ± 0.2 eV.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 841-844
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature and Composition Dependence of Photovoltaic Spectra of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se Diodes
    Autorzy:
    Khoi, Le Van
    Szczerbakow, A.
    Karczewski, G.
    Gałązka, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1886570.pdf
    Data publikacji:
    1991-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    Opis:
    Photovoltaic spectra of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se homojunctions have been measured in the infrared spectral region within the temperature range 15-300 K. The junctions have been formed by cadmium diffusion into the p-type Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se crystals with manganese content 0 ≤ x ≤ 0.08. From the positions of the photovoltaic maxima the energy band gap of the diode material has been determined. A phenomenological expression describing the energy band gap of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se as a function of temperature and crystal composition has been proposed. In diodes containing high manganese content x = 0.06 and x = 0.08 a second photovoltaic maximum caused by indirect optical transitions between the main conduction band and the secondary valence band located along the $\Sigma$-axis of the Brillouin zone has been observed.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 2-3; 287-290
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance and Electroluminescence near the Curie-Weiss Temperature in the $Zn_{1-x}Mn_{x}Te$ Light Emitting Devices
    Autorzy:
    Van Khoi, Le
    Avdonin, A.
    Szymczak, R.
    Gałązka, R.
    Potemski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791358.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Gm
    71.70.Ej
    75.50.Pp
    78.20.Ls
    78.60.Fi
    Opis:
    The light emitting devices based on the $p-Zn_{1-x}Mn_{x}Te$ bicrystals have been fabricated. The $Zn_{1-x}Mn_{x}Te$ devices produce red and green emission originating from the internal d-shell transitions in the $Mn^{2+}$ ions and the donor-acceptor pairs recombination, respectively. A critical behavior of the magnetic field dependence of the green emission intensity and a positive magnetoresistance near the Curie-Weiss temperature in the $Zn_{1-x}Mn_{x}Te$ devices was observed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 941-943
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetooptical Properties of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se p-n Junctions
    Autorzy:
    Khoi, Le Van
    Karczewski, G.
    Dobrowolski, W.
    Kossut, J.
    Gałązka, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891332.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    78.20.Ls
    72.80.Ga
    Opis:
    The first experimental evidence of the magnetic quantum oscillation in the photovoltaic effect of Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se p-n junctions is reported. The p-n junctions were obtained in Pb$\text{}_{1-x}$MnxSe crystals with manganese content, 0 ≤ x ≤ 0.08 by introducing Cd donors by diffusion. Measurements were per formed between 5-85 K and in the presence of the magnetic field 0-7 T in the Faraday and Voigt configurations of the incident infrared radiation of various photon energies in the vicinity of the energy gap of a Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se. Strong oscillatory behavior of the photovoltage was observed as a function of the magnetic field intensity at a constant wavelength of the incident light. Using the model of Adler of the energy band structure modified by the exchange terms, and after identification of the initial and final states of the transitions, we derive the band parameters of the Pb$\text{}_{1-x}$Mn$\text{}_{x}$Se crystals.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 445-448
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Optical Properties of Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$O$\text{}_{y}$ Highly Mismatched Alloy
    Autorzy:
    Avdonin, A.
    Van Khoi, Le.
    Pacuski, W.
    Domukhovski, V.
    Gałązka, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047712.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.72.Vv
    78.55.-m
    Opis:
    The Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$O$\text{}_{y}$ alloy was prepared using a rapid crystallization technique. X-ray diffraction measurements were used to estimate the oxygen doping level. It is demonstrated that the oxygen solubility in Zn$\text{}_{1-x}$ Mn$\text{}_{x}$Te$\text{}_{1-y}$O$\text{}_{y}$ alloys greatly depends on the manganese concentration. No oxygen related effects were observed in the manganese free samples. The highest value of the oxygen molar fraction (y) achieved in the present study was 0.0023 in a sample having manganese fraction (x) of 0.056. The decrease in the alloy band gap was observed with increasing oxygen content. The oxygen-related trap level in Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$O$\text{}_{y}$ was found to be strongly shifted with respect to that in ZnTe$\text{}_{1-y}$O$\text{}_{y}$. The shift is assigned to a creation of complex (Mn$\text{}_{x}$O) traps.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 407-414
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-Induced Persistent Photoconductivity in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ Heterojunctions
    Autorzy:
    Van Khoi, Le
    Dobrowolski, W.
    Zakrzewski, A.
    Dobaczewski, L.
    Gałązka, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952039.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    78.20.Ls
    72.80.Ga
    Opis:
    At temperatures lower than 200 K the photomemory effect has been observed in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions. The persistent photoconductivity can be achieved either by illumination from an external light source or by a self-absorption of the electroluminescence radiation when a voltage of about 10 V for a few seconds is applied to the diode. Current-voltage characteristics are of the form I~ V$\text{}^{m}$. The capacitance and electroluminescence measurements show that the photomemory effect in ZnTe-Cd$\text{}_{1-x}$Mn$\text{}_{x}$ Te$\text{}_{1-y}$Se$\text{}_{y}$ heterojunctions can be caused by the bistable nature of the In dopant in the Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ substrate. In the high resistivity interface layer and the substrate material indium forms centers similar to DX-like centers in Zn$\text{}_{x}$Cd$\text{}_{1-x}$Te and Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 883-886
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Electrical Properties of Phosphorus Doped Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te Crystals
    Autorzy:
    Van Khoi, Le
    Jaroszyński, J.
    Witkowska, B.
    Mycielski, A.
    Gałązka, R. R.
    Cisowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968127.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.30.+h
    71.55.Jv
    72.80.Ga
    Opis:
    The high pressure Bridgman technique was used to grow Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te:P crystals. Under the N$\text{}_{2}$ pressure of 30 atm., we obtained the p$\text{}^{+}$-Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te single crystals 8-10 mm in diameter, with free-carrier densities as high as p ≈ 8×10$\text{}^{18}$ cm$\text{}^{-3}$ and the room temperature conductivity σ(RT) ≈ 30 Ω$\text{}^{-1}$cm$\text{}^{-1}$. Magnetoresistance measurements were carried out down to 1.3 K and up to 6 T. In Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te:P a strong increase in the acceptor binding energy as well as an immense (ρ(0,1.3K)/ρ(6T,1.3K) > 10$\text{}^{3}$) negative magnetoresistance are observed, by contrast, not seen in diamagnetic ZnTe:P. It is shown that these effects come from the formation of bound magnetic polarons and their destruction by an external magnetic field.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 833-836
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Dependent Interactions of Free Carriers and Manganese Ions in Nanostructures of Wide Band Gap II-Mn-VI Semiconductors - Mechanism of Lifetime Reduction
    Autorzy:
    Yatsunenko, S.
    Khachapuridze, A.
    Ivanov, V. Yu.
    Godlewski, M.
    Khoi, Le Van
    Gołacki, Z.
    Karczewski, G.
    Goldys, E. M.
    Phillips, M.
    Klar, P. J.
    Heimbrodt, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036034.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    76.30.Fc
    76.70.Hb
    78.55.Et
    Opis:
    Based on the results of optically detected magnetic resonance and time-resolved investigations we relate the observed lifetime shortening of intra-shell Mn$\text{}^{2+}$ emission to spin dependent magnetic interactions between localized spins of Mn$\text{}^{2+}$ ions and spins/magnetic moments of free carriers. We show that this mechanism is active in both bulk and in low dimensional structures, such as quantum wells, quantum dots, and nanostructures.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 643-648
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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