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1
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Transition Metal Impurities and Electronic Structure of ZnSe-Based Isovalent Semiconductor Alloys

100%
Surkova T. P., Giriat W., Godlewski M., Permogorov S.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 5
1009-1012
EN
Energy level positions of the nickel 2+/1+ and cobalt 2+/3+ charge states have been used to estimate band edges for the valence and conduction bands of ZnSe-based alloys with cation (ZnCdSe) and anion (ZnSSe) substitution. Chemical trends in band offsets of heterostructures of Zn- or Mn-based II-VI compounds are analysed. Further on, the change of Ni^{2+}(3d^{8}) and Co^{2+}(3d^{7}) intra-d shell transition bands upon the alloying of host material is discussed.
2
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Excitonic Spectra of Cd_{1-x}Fe_{x}Te Crystals

100%
Permogorov S., Tenishev L., Surkova T.
Acta Physica Polonica A
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1992
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vol. 82
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issue 4
702-704
EN
Strong modification of the optical spectra near the band-gap edge is observed in Cd_{1-x}Fe_{x}Te crystals as compared to the spectra of a pure compound. The evolution of the luminescence spectra at the increase in Fe concentration is represented by the change of radiative recombination channels from dominantly (A^{0}, x) acceptor bound exciton emission in undoped CdTe to the free exciton luminescence in Cd_{1-x}Fe_{x}Te solid solutions.
3
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Energy States of Ni in Zn_{1-x}Mn_{x}Se:Ni Solid Solutions

100%
Permogorov S., Tenishev L., Sokolov V., Surkova T.
Acta Physica Polonica A
|
1992
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vol. 82
|
issue 4
705-708
EN
Absorption and reflectivity measurements were carried out on Zn_{1-x}Mn_{x}Se:Ni solid solutions. The spectra demonstrate the radical change of the structure of internal Ni^{2+}(3d^{8}) transitions at the presence of the Mn ions and strong dependence on Mn concentration. The threshold energy ħω_{th} for the process of Ni photoionization to the valence band Ni^{2+}(3d^{8}) + ħω_{th} → Ni^{1+}(3d^{9}) + h is shifted to the lower energy by 30 meV, but hardly depends on x despite the essential increase in the energy gap.
4
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Free Exciton Luminescence in ZnCdSe Solid Solutions, ZnSe Epitaxial Films and ZnSe_{1-x}S_{x}/ZnSe_{1-y}S_{y} Superlattices

88%
Tenishev L., Permogorov S., Fedorov D., Yakushcheva G., Kuznetsov P.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
959-964
EN
We studied the luminescence of bulk Zn_{1-x}Cd_{x}Se solid solutions, epitaxial ZnSe films and ZnSe_{1-x}S_{x}/ZnSe_{1-y}S_{y} superlattices at T=2-80 K. The analysis of the bands of exciton radiative annihilation with simultaneous emission of 1 or 2 LO phonons shows that the excitons in the studied samples can be considered as free particles with thermalized distribution of kinetic energies. In ZnSe_{1-x}S_{x}/ZnSe_{1-y}S_{y} superlattices a three-dimensional character of exciton motion was established. The periodic potential of superlattice perturbs the exciton wave vector and induces additional elastic scattering of excitons.
5
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Energy Level Position of Ni and Band Offsets in Zn_{1-x}Cd_{x}Sc:Ni and ZnS_{x}Sc_{1-x}:Ni

76%
Surkova T., Giriat W., Godlewski M., Kaczor P., Zakrzewski A. J., Permogorov S., Tenishev L.
Acta Physica Polonica A
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1995
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vol. 88
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issue 5
925-928
EN
Absorption and reflectivity measurements have been carried out for Zn_{1-x}Cd_{x}Se:Ni and ZnS_{x}Se_{1-x}:Ni solid solutions. Energy level positions of nickel 2+/1+ charge state have been used for estimation of band offsets for the valence and conduction bands of ZnCdSe/ZnSe and ZnSSe/ZnSe. Intra-shell transitions of Ni^{2+} were also studied.
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