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    Wyświetlanie 1-15 z 15
    Tytuł:
    Crystallographic Properties of Bulk GaN Crystals Grown at High Pressure
    Autorzy:
    Leszczyński, M.
    Grzegory, I.
    Bockowski, M.
    Jun, J.
    Porowski, S.
    Jasiński, J.
    Baranowski, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933847.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Dd
    61.50.Cj
    Opis:
    Gallium nitride bulk crystals grown at about 15 kbar and 1500 K have been examined by using the high resolution X-ray diffractometry. An analysis of a set of the rocking curves of various Bragg reflections enabled us to estimate a dislocation density. For the crystals of dimensions lower than about 1 mm it is lower than 10$\text{}^{-5}$ cm$\text{}^{-2}$. For bigger samples the crystallographic quality worsens. With an application of the reciprocal lattice mapping we could distinguish between internal strains and mosaicity which are both present in these crystals The results for the bulk crystals are compared with those for epitaxial layers.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 799-802
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Expansion of GaN Bulk Crystals and Homoepitaxial Layers
    Autorzy:
    Leszczyński, M.
    Teisseyre, H.
    Suski, T.
    Grzegory, I.
    Boćkowski, M.
    Jun, J.
    Pałosz, B.
    Porowski, S.
    Pakuła, K.
    Baranowski, J. M.
    Barski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952040.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ji
    61.72.Vv
    Opis:
    Thermal expansion of gallium nitride was measured using high resolution X-ray diffraction. The following samples were examined: (i) single monocrystals grown at pressure of about 15 kbar, (ii) homoepitaxial layers. The main factor influencing both, the lattice parameters and the thermal expansion coefficient, are free electrons related to the nitrogen vacancies. The origin of an increase in the lattice constants by free electrons is discussed in terms of the deformation potential of the conduction-band minimum. An increase of the thermal expansion by free electrons is explained by a decrease of elastic constants.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 887-890
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Blue Laser on High N$\text{}_{2}$ Pressure-Grown Bulk GaN
    Autorzy:
    Grzegory, I.
    Boćkowski, M.
    Krukowski, S.
    Łucznik, B.
    Wróblewski, M.
    Weyher, J.
    Leszczyński, M.
    Prystawko, P.
    Czernecki, R.
    Lehnert, J.
    Nowak, G.
    Perlin, P.
    Teisseyre, H.
    Purgał, W.
    Krupczyński, W.
    Suski, T.
    Dmowski, L.
    Litwin-Staszewska, E.
    Skierbiszewski, C.
    Łepkowski, S.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030423.pdf
    Data publikacji:
    2001-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Opis:
    In this note we report briefly on the details of pulsed-current operated "blue" laser diode, constructed in our laboratories, which utilizes bulk GaN substrate. As described in Ref. [1] the substrate GaN crystal was grown by HNPSG method, and the laser structure was deposited on the conducting substrate by MOCVD techniques (for the details see Sec. 2 and Sec. 4 of Ref.~[1], respectively).
    Źródło:
    Acta Physica Polonica A; 2001, 100, Supplement; 229-232
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observation of Magnetic Anisotropy in Bulk GaMnN:Mg Crystals
    Autorzy:
    Gosk, J.
    Zając, M.
    Kamińska, M.
    Twardowski, A.
    Grzegory, I.
    Boćkowski, M.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036861.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    75.30.Gw
    75.50.Pp
    Opis:
    Magnetic properties of bulk wurtzite n-type GaMnN and highly resistive GaMnN:Mg monocrystals were studied for the magnetic field applied parallel and perpendicular to the crystal hexagonal c-axis. Magnetization of both types of samples reveals paramagnetic behavior. However, for n-type GaMnN isotropic magnetization was observed which is in agreement with Mn d$\text{}^{5}$ configuration. On the other hand, GaMnN co-doped with Mg shows large magnetic anisotropy which suggests Mn to be in nonspherical d$\text{}^{4}$ or d$\text{}^{3}$ configuration.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 665-669
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Electron Transition in Homoepitaxial GaN Layers
    Autorzy:
    Fiorek, A.
    Baranowski, J. M.
    Wysmołek, A.
    Pakuła, K.
    Wojdak, M.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968067.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Fd
    78.55.Cr
    Opis:
    It is shown that the luminescence mapping is a powerful method to help identify optical transitions. Two-electron transition was identified in the homoepitaxial GaN layer by this technique. It was found that the donor and acceptor bound exciton emissions are spatially displaced and show intensity maxima at different places of the epitaxial layer. It was also found that the 3.45 eV line, suspected as "two-electron transition", follows exactly the donor bound exciton spatial distribution. Donor bound exciton recombines leaving the neutral donor in the excited 2s state. Thus, 1s-2s excitation being equal to 22 meV corresponds to 29 meV hydrogenic donor binding energy. This is the first identification of the two-electron transition in GaN.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 742-744
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth of GaN Metalorganic Chemical Vapour Deposition Layers on GaN Single Crystals
    Autorzy:
    Pakula, K.
    Baranowski, J. M.
    Stępniewski, R.
    Wysmołek, A.
    Grzegory, I.
    Jun, J.
    Porowski, S.
    Sawicki, M.
    Starowieyski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933937.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Fd
    78.55.Cr
    Opis:
    The homoepitaxial growth of GaN layers has been achieved for the first time. Bulk GaN single crystals which have been used as a substrate have been grown from diluted solution of atomic nitrogen in the liquid gallium at 1600°C and at nitrogen pressure of about 15-20 kbar. It is shown that a terrace growth of GaN epitaxial layer has been realized. The high quality of the GaN film has been confirmed by luminescence measurements. The analysis of donor-acceptor and exciton luminescence is presented.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 861-864
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MnAs Overlayer on GaN(000$\text{}_{1}$)-(1 x 1) - Its Growth, Morphology and Electronic Structure
    Autorzy:
    Kowalski, B. J.
    Kowalik, I. A.
    Iwanowski, R. J.
    Łusakowska, E.
    Sawicki, M.
    Sadowski, J.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038151.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    73.20.At
    Opis:
    MnAs layer has been grown by means of MBE on the GaN(000$\text{}_{1}$)-(1 x 1) surface. Spontaneous formation of MnAs grains with a diameter of 30-60 nm (as observed by atomic force microscopy) occurred for the layer thickness bigger than 7 ML. Ferromagnetic properties of the layer with Curie temperature higher than 330 K were detected by SQUID measurements. Electronic structure of the system was investigated in situ by resonant photoemission spectroscopy for MnAs layer thickness of 1, 2, and 8 ML. Density of the valence band states of MnAs and its changes due to the increase in the layer thickness were revealed.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 645-650
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Resistivity GaN Single Crystalline Substrates
    Autorzy:
    Porowski, S.
    Boćkowski, M.
    Łucznik, B.
    Grzegory, I.
    Wróblewski, M.
    Teisseyre, H.
    Leszczyński, M.
    Litwin-Staszewska, E.
    Suski, T.
    Trautman, P.
    Pakuła, K.
    Baranowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968415.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    72.80.Ey
    Opis:
    High resistivity 10$\text{}^{4}$-10$\text{}^{6}$ Ω cm (300 K) GaN single crystals were obtained by solution growth under high N$\text{}_{2}$ pressure from melted Ga with 0.1-0.5at.% of Mg. Properties of these crystals are compared with properties of conductive crystals grown by a similar method from pure Ga melt. In particular, it is shown that Mg-doped GaN crystals have better structural quality in terms of FWHM of X-ray rocking curve and low angle boundaries. Temperature dependence of electrical resistivity suggests hopping mechanism of conductivity. It is also shown that strain free GaN homoepitaxial layers can be grown on the Mg-doped GaN substrates.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 958-962
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanisms of Yellow and Red Photoluminescence in Wurtzite and Cubic GaNDOI
    Autorzy:
    Godlewski, M.
    Suski, T.
    Grzegory, I.
    Porowski, S.
    Langer, R.
    Barski, A.
    Bergman, J. P.
    Monemar, B.
    Goldys, E. M.
    Phillips, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969079.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.Ch
    61.72.Ff
    71.55.Eq
    Opis:
    The origin of two "deep" photoluminescence (PL) emissions observed in wurtzite (yellow PL) and cubic (red PL) GaN is discussed. PL and time-resolved PL studies confirm donor-acceptor pair character of the yellow band in wurtzite GaN and point to participation of shallow donors in this emission. A similar PL mechanism is proposed for the red emission of cubic GaN. We further show a puzzling property of both yellow and red PLs. Both yellow and red emissions show spatial homogeneity and are only weakly dependent on surface morphology.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 326-330
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence Dynamics of Exciton Replicas in Homoepitaxial GaN Layers
    Autorzy:
    Korona, K. P.
    Baranowski, J. M.
    Pakuła, K.
    Monemar, B.
    Bergman, J. P.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968240.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.-y
    78.47.+p
    78.55.Cr
    Opis:
    Photoluminescence of excitons and their phonon replicas in homoepitaxial MOCVD-grown gallium nitride (GaN) layers have been studied by picosecond (ps) time-resolved photoluminescence spectroscopy. The time-resolved photoluminescence spectroscopy has shown that the free excitons and their replicas have the fastest dynamics (decay time of about 100 ps). Then, the excitons-bound-to-donors emission rises (with the rise time similar to the free excitons decay time) and decays with t=300 ps. The excitons-bound-to-acceptors has the slowest decay (about 500 ps). It has been found that the ratio of excitons-bound-to-acceptors and excitons-bound-to-donors amplitudes and their decay times are different for 1-LO replicas and then for zero-phonon lines, whereas the ratio of amplitudes and the decay time of the 2-LO replicas are similar to the ones of the zero-phonon lines.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 841-844
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Power Continuous Wave Blue InAlGaN Laser Diodes Made by Plasma Assisted MBE
    Autorzy:
    Skierbiszewski, C.
    Siekacz, M.
    Wiśniewski, P.
    Perlin, P.
    Feduniewicz-Żmuda, A.
    Cywiński, G.
    Smalc, J.
    Grzanka, S.
    Grzegory, I.
    Leszczyński, M.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047002.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    85.35.Be
    42.60.By
    73.21.Cd
    Opis:
    Room temperature, continuous wave operation of InGaN multi-quantum wells laser diodes made by rf plasma assisted molecular beam epitaxy at 411 nm wavelength is demonstrated. The threshold current density and voltage were 4.2 kA/cm$\text{}^{2}$ and 5.3 V, respectively. High optical power output of 60 mW was achieved. The lifetime of these laser diodes exceeds 5 h with 2 mW of optical output power. The laser diodes are fabricated on low dislocation density bulk GaN substrates, at growth conditions which resembles liquid phase epitaxy. We demonstrate that relatively low growth temperatures (600-700°C) pose no intrinsic limitations for fabrication of nitride optoelectronic components by plasma assisted molecular beam epitaxy.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 345-351
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupling of LO Phonons to Excitons in GaN
    Autorzy:
    Wysmołek, A.
    Łomiak, P.
    Baranowski, J. M.
    Pakuła, K.
    Stępniewski, R.
    Korona, K. P.
    Grzegory, I.
    Boćkowski, M.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952430.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    63.20.Mt
    71.55.Eq
    Opis:
    The photoluminescence of homoepitaxial and heteroepitaxial GaN layers is reported. It is shown that the coupling between LO phonons and neutral acceptor bound excitons is much stronger than the coupling between LO phonons and neutral donor bound excitons. In undoped homoepitaxial layer, in spite of that the no-phonon emission due to donor bound excitons is one order of magnitude stronger than the acceptor bound excitons emission, the predominant structure in the LO phonon replica of the excitonic spectrum is related to optical transitions involving acceptor bound excitons. Temperature studies showed that at higher temperature the LO phonon replica is related to free excitons.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 981-984
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of Very Small Zeeman Splittings in GaN:Mn,Mg by Faraday Rotation
    Autorzy:
    Wołoś, A.
    Kossacki, P.
    Golnik, A.
    Kamińska, M.
    Gaj, J. A.
    Twardowski, A.
    Grzegory, I.
    Boćkowski, M.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035615.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ls
    71.70.Ej
    71.55.Eq
    71.20.Nr
    Opis:
    In this work we demonstrate an application of Faraday rotation for measuring an extremely small Zeeman splitting of an Mn related absorption line placed at 1.417 eV in optical absorption spectrum of Mn and Mg doped gallium nitride. Analysis of the collected spectra allowed us to determine the value of the splitting as equal to 0.12±0.01 meV at 6 T. This data should help in establishing the nature of the observed absorption band.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 695-699
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Pressure Freeze-out of Electrons in Undoped GaN Crystal. Proof of Existence of Resonant Donor State (Nitrogen Vacancy)
    Autorzy:
    Perlin, P.
    Teisseyre, H.
    Suski, T.
    Leszczyński, M.
    Grzegory, I.
    Jun, J.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931916.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    71.55.Eq
    Opis:
    We investigated free carriers related optical absorption in GaN in hydrostatic pressures up to 30 GPa. The disappearance of this absorption at pressures close to 18 GPa was explained by trapping electrons resulting from the shift of nitrogen vacancy related donor level into the GaN energy gap at high pressure. We estimated the energetic position of this level at atmospheric pressure to be about 0.8 eV above the conduction band minimum.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 141-143
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epitaxial Layers Versus Bulk Single Crystals of GaN. Temperature Studies of Lattice Parameters and Energy Gap
    Autorzy:
    Teisseyre, H.
    Perlin, P.
    Leszczyński, M.
    Suski, T.
    Dmowski, L.
    Grzegory, I.
    Porowski, S.
    Jun, J.
    Moustakas, T. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1873040.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.70.+y
    78.50.Ge
    78.66.Fd
    Opis:
    Gallium nitride epitaxial layer grown by molecular beam epitaxy and bulk crystal grown at high pressure were examined by using X-ray diffraction methods, and by optical absorption at a wide temperature range. The free electron concentration was 6 × 10$\text{}^{17}$ cm$\text{}^{-3}$ for the layer and about 5 × 10$\text{}^{19}$ cm$\text{}^{-3}$ for the bulk crystal. The experiments revealed a different position of the absorption edge and its temperature dependence for these two kinds of samples. The structural examinations proved a significantly higher crystallographic quality of the bulk sample. However, the lattice constants of the samples were nearly the same. This indicated that a rather different electron concentration was responsible for the different optical properties via Burstein-Moss effect.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 403-406
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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