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Wyświetlanie 1-15 z 20
Tytuł:
ZnS/ZnSe Superlattices under Pressure
Autorzy:
Gorczyca, I.
Christensen, N. E.
Powiązania:
https://bibliotekanauki.pl/articles/1929746.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Tn
73.20.Dx
Opis:
Self-consistent linear muffin-tin orbital method is used to calculate the band structure of ZnS/ZnSe (001) strained-layer superlattice and investigate the influence of hydrostatic pressure on the valence band offset (VBO). Three different strain modes corresponding to various values of the relative thicknesses of both materials are considered. A I → II type conversion associated with the conduction-band crossover between the ZnSe well and ZnS barrier layers is found in agreement with recent experimental data.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 753-756
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study of Optical and XANES Spectra for CdTe within the k-dependent Matrix Element Approach
Autorzy:
Markowski, R.
Oleszkiewicz, J.
Kisiel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1923768.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Dm
78.20.Bh
71.25.Tn
Opis:
The reflectivity and X-ray absorption near-edge structure spectra for CdTe were calculated with the inclusion of the transition matrix elements from band structure obtained within self-consistent, relativistic linear muffin tin orbital method. The results were compared with experimental data for the case of CdTe and with our previous calculations.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 785-788
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Dipol Transition Matrix Element on the XANES and Optical Spectra for CdTe
Autorzy:
Markowski, R.
Oleszkiewicz, J.
Kisiel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1890915.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Dm
78.20.Bh
71.25.Tn
Opis:
The reflectivity and X-ray absorption near-edge spectra (XANES) for CdTe have been calculated with inclusion of the transition matrix element from band structure obtained from self-consistent linear muffin-tin-orbital (LMTO) method. The result has been compared with experimental data for the case of CdTe.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 369-372
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:
Surface Photovoltage Spectroscopy of Cd$\text{}_{0.97}$Fe$\text{}_{0.03}$Se and Cd$\text{}_{0.97}$Fe$\text{}_{0.03}$Te Crystals
Autorzy:
Sarem, A.
Οrlowski, B.
Kuźmiński, S.
Powiązania:
https://bibliotekanauki.pl/articles/1879851.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Tn
Opis:
The surface electronic structure of the Cd$\text{}_{1-x}$Fe$\text{}_{x}$Se and Cd$\text{}_{1-x}$Fe$\text{}_{x}$Τe crystals with x = 0 and x = 0.03 has been studied by Surface Photovoltage Spectroscopy (SPS). The change of surface photovoltage was observed due to photo-excitation of the electrons from the deep donor state Fe 3d to conduction band edge. This gave possibility to determine energy position of the Fe 3d state at 0.64 and 0.15 eV over the top of the valence band for CdSe and CdTe, respectively.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 183-186
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
s,p-d Exchange Constants of CdFeSe Semimagnetic Semiconductor
Autorzy:
Arciszewska, M.
Pakuła, K.
Perez, I.
Twardowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1886791.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Tn
71.70.Gm
71.35.+z
Opis:
We report determination of s, p-d exchange constants for hexagonal CdFeSe combining exciton splitting and magnetization measurements performed on the same samples.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 345-348
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:
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:
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:
Photoemission and Inverse Photoemission Studies of SiO$\text{}_{2}$
Autorzy:
Sobczak, A.
Nietubyć, R.
Sobczak, J. W.
Powiązania:
https://bibliotekanauki.pl/articles/1931764.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Kz
71.25.Tn
79.60.Ht
Opis:
Occupied and unoccupied electron states of amorphous silicon dioxide film supported on Si crystal are studied by using X-ray photoemission and, for the first time, X-ray inverse photoemission (X-ray bremsstrahlung isochromat method). A special care was undertaken to minimize decomposition of silicon oxide during X-ray bremsstrahlung measurements. The experimental spectra are compared with theoretical band structure calculations for amorphous SiO$\text{}_{2}$ from the literature and good overall agreement is found.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 837-843
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peculiarities of Composition and Temperature Dependence of Energy-Band Parameters of Zn$\text{}_{x}$Cd$\text{}_{y}$Hg$\text{}_{1-x-y}$Te
Autorzy:
Andrukhiv, A.
Ivanov-Omskii, V.
Polit, J.
Sheregii, E.
Powiązania:
https://bibliotekanauki.pl/articles/1876920.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Tn
Opis:
The influence of addition of Zn on band parameters of Zn$\text{}_{x}$Cd$\text{}_{y}$Hg$\text{}_{1-x-y}$Te solid solution at different temperatures (4.2-200 K) was investigated. The cyclotron resonance at 4.2 K and magnetophonon resonance at 77-200 K were used to determine band structure parameters. The temperature dependence of band structure parameters (energy gap, effective mass of electron) for the composition of series of epilayers (x varied in 0.08-0.20 range and y - 0.07-0.12) was obtained. It is found that band structure parameters for some compositions (for example x = 0.17, y = 0.08) are almost independent from temperature and equal: γ₁$\text{}^{L}$= 19.55, γ₂$\text{}^{L}$ = γ₃$\text{}^{L}$ = 8.5, K$\text{}^{L}$ = 6.48, F = -0.5, E$\text{}_{g}$ = 0.35 eV, E$\text{}_{p}$ = 17.9 eV. The effective mass of electrons was found to be greater with addition of Zn while the effective mass of heavy holes is left unchanged.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 513-517
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear Temperature Dependence of the Band Gap in Hg$\text{}_{1-x-y}$Cd$\text{}_{x}$Mn$\text{}_{y}$Te and Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te Alloys
Autorzy:
Dudziak, E.
Jędral, L. Z.
Bożym, J.
Brzeziński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1886577.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Tn
65.70.+y
Opis:
The temperature dependence of the band gap for HgCdTe and HgCdMnTe has been experimentally investigated in the temperature range of 7-250 K. The distinct nonlinear dependence has been observed in the low temperature range. It was shown that the lattice dilatation contribution calculated for HgCdTe is a significant part (about 30%) of the total temperature shift of the energy gap.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 291-294
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetooptical Studies of CdTe-Rich Epitaxial Layers
Autorzy:
Dudziak, E.
Bożym, J.
Pruchnik, D.
Jędral, L. Z.
Powiązania:
https://bibliotekanauki.pl/articles/1890795.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Tn
72.40.+w
78.20.Ls
Opis:
The first magnetooptical studies comprising magnetoreflection, magnetoabsorption and Faraday rotation of CdTe-rich Hg$\text{}_{1-x-y}$Cd$\text{}_{x}$Mn$\text{}_{y}$Te are reported. The drastic disappearing of excitonic structure, for already very small Hg content, has been observed. The exchange parameters close to those for CdMnTe have been found.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 325-328
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:
Influence of Chemistry on the Energy Band Structure: AlAs Versus GaAs
Autorzy:
Bogusławski, P.
Gorczyca, I.
Powiązania:
https://bibliotekanauki.pl/articles/1891295.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Tn
71.10.+x
Opis:
Energy band structure of AlAs and GaAs is analyzed in terms of the energy structure of the constituent atoms. Conduction band wave functions are projected on s-, p-, and d-symmetry atomic orbitals. The resulting information is combined with the eigenenergies of Al and Ga atoms, in order to-discuss the character of the band gaps, and the sign of deformation potentials.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 433-436
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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