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Dependence of Exciton Linewidth on the Composition of Zn_{x}Mg_{1-x}Se Layers Grown by MBE

100%
Bała W., Głowacki G., Gapiński A.
Acta Physica Polonica A
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1995
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vol. 88
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issue 4
667-670
EN
This work deals with the study of the photoluminescence and reflectiv­ity properties of Zn_{x}Mg_{1-x}Se epilayers grown by molecular beam epitaxy on (001)GaAs and (111)ZnTe substrates. The photoluminescence spectra of Zn_{x}Mg_{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_{0.78}Μg_{0.22}Se.
2
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Luminescence of Zn_{x}Mg_{1-x}Se Layers Obtained by Thermal Diffusion of Mg into ZnSe and Zn_{x}Mg_{1-x}Se Epilayers Grown by Molecular Beam Epitaxy

88%
Bała W., Firszt F., Głowacki G., Gapiński A., Dzik J.
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EN
This work deals with the study of photoluminescence properties of Zn_{x}Mg_{1-x}Se epilayers grown by molecular beam epitaxy on (001) GaAs and (111) ZnTe substrates and Zn_{x}Mg_{1-x}Se layers obtained by thermal diffusion of Mg into ZnSe single crystals. Luminescence spectra of Zn_{x}Mg_{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.
3
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Optical Properties of Zn_{1-x}Mg_{x}Se Epilayers Studied by Spectroscopy Methods

88%
Głowacki G., Gapiński A., Derkowska B., Bała W., Sahraoui B.
Acta Physica Polonica A
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1998
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vol. 94
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issue 2
321-325
EN
Linear optical properties of the Zn_{1-x}Mg_{x}Se (0 ≤ x ≤ 0.4) alloys have been studied using reflectance, spectroscopic ellipsometry and photoluminescence measurements. The refractive indices of Zn_{1-x}Mg_{x}Se epilayers were investigated as a function of Mg composition (0 ≤ x ≤ 0.4). The energies of band gap E_{g} and spin-orbit splitting E_{g}+Δ, have been determined. These energies are shifted gradually to higher values with increasing Mg content.
4
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Raman Analysis of Zn_{1-x}Mg_{x}Se Layers Grown on GaAs and ZnTe Substrates

76%
Renucci M., Frandon J., Głowacki G., Gapiński A., Rozpłoch F., Bała W.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
1065-1069
EN
A study of the Raman scattering in Zn_{1-x}Mg_{x}Se (0 ≤ x ≤ 0.4) epilayers grown by molecular beam epitaxy on (100) GaAs and (111)_{Zn} ZnTe substrates has been performed. Two kinds of longitudinal optical phonon modes (LO_{Zn-Se} and LO_{Mg-Se}) were observed under excitation of the Ar^{+} and Kr^{+} laser lines at room temperature, whose frequencies and intensities depend characteristically on the Mg content.
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