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Title: Electronic spectrum of non-tetrahedral acceptors in CdTe:Cl and CdTe:Bi,Cl single crystals

Abstract

The electronic spectra of complex acceptors in compensated CdTe:Cl, CdTe:Ag,Cl, and CdTe:Bi,Cl single crystals are studied using low-temperature photoluminescence (PL) measurements under both nonresonant and resonant excitation of distant donor–acceptor pairs (DAP). The wavelength modulation of the excitation source combined with the analysis of the differential PL signal is used to enhance narrow spectral features obscured because of inhomogeneous line broadening and/or excitation transfer for selectively excited DAPs. For the well-known tetrahedral (T{sub D}) Ag{sub Cd} acceptor, the energies of four excited states are measured, and the values obtained are shown to be in perfect agreement with the previous data. Moreover, splitting between the 2P{sub 3/2} (Γ{sub 8}) and 2S{sub 3/2} (Γ{sub 8}) states is clearly observed for Ag{sub Cd} centers located at a short distance (5–7 nm) from a hydrogen-like donor (Cl{sub Te}). This splitting results from the reduction of the T{sub D} symmetry taking place when the acceptor is a member of a donor–acceptor pair. For the Cl-related complex acceptor with an activation energy of ∼121 meV (A-center), the energies of eight excited states are measured. It is shown that this defect produces low-symmetry central-cell correction responsible for the strong splitting of S-like T{sub D} shells. The energy spectrum ofmore » the Bi-related shallow acceptor with an activation energy of ∼36 meV is measured as well. The spectrum obtained differs drastically from the hydrogen-like set of levels, which indicates the existence of repulsive low-symmetry perturbation of the hydrogen-like Coulomb potential. It is also shown that the spectra of selectively excited PL recorded for a macroscopic ensemble of distant donor–acceptor pairs allow one to detect the low symmetry of acceptors of a given type caused by their complex nature or by the Jahn–Teller distortion. This method does not require any additional (external) field and is applicable to acceptors in diverse zinc-blende compound semiconductors.« less

Authors:
; ; ; ; ; ;  [1]
  1. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22494992
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 5; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; A CENTERS; ACTIVATION ENERGY; CADMIUM TELLURIDES; ENERGY SPECTRA; EXCITATION; EXCITED STATES; HYDROGEN; MODULATION; MONOCRYSTALS; PHOTOLUMINESCENCE; SIGNALS; WAVELENGTHS

Citation Formats

Krivobok, V. S., E-mail: krivobok@lebedev.ru, Moscow Institute of Physics and Technology, Nikolaev, S. N., Bagaev, V. S., Pruchkina, A. A., Onishchenko, E. E., Kolosov, S. A., Klevkov, Yu. V., and Skorikov, M. L. Electronic spectrum of non-tetrahedral acceptors in CdTe:Cl and CdTe:Bi,Cl single crystals. United States: N. p., 2016. Web. doi:10.1063/1.4941026.
Krivobok, V. S., E-mail: krivobok@lebedev.ru, Moscow Institute of Physics and Technology, Nikolaev, S. N., Bagaev, V. S., Pruchkina, A. A., Onishchenko, E. E., Kolosov, S. A., Klevkov, Yu. V., & Skorikov, M. L. Electronic spectrum of non-tetrahedral acceptors in CdTe:Cl and CdTe:Bi,Cl single crystals. United States. https://doi.org/10.1063/1.4941026
Krivobok, V. S., E-mail: krivobok@lebedev.ru, Moscow Institute of Physics and Technology, Nikolaev, S. N., Bagaev, V. S., Pruchkina, A. A., Onishchenko, E. E., Kolosov, S. A., Klevkov, Yu. V., and Skorikov, M. L. Sun . "Electronic spectrum of non-tetrahedral acceptors in CdTe:Cl and CdTe:Bi,Cl single crystals". United States. https://doi.org/10.1063/1.4941026.
@article{osti_22494992,
title = {Electronic spectrum of non-tetrahedral acceptors in CdTe:Cl and CdTe:Bi,Cl single crystals},
author = {Krivobok, V. S., E-mail: krivobok@lebedev.ru and Moscow Institute of Physics and Technology and Nikolaev, S. N. and Bagaev, V. S. and Pruchkina, A. A. and Onishchenko, E. E. and Kolosov, S. A. and Klevkov, Yu. V. and Skorikov, M. L.},
abstractNote = {The electronic spectra of complex acceptors in compensated CdTe:Cl, CdTe:Ag,Cl, and CdTe:Bi,Cl single crystals are studied using low-temperature photoluminescence (PL) measurements under both nonresonant and resonant excitation of distant donor–acceptor pairs (DAP). The wavelength modulation of the excitation source combined with the analysis of the differential PL signal is used to enhance narrow spectral features obscured because of inhomogeneous line broadening and/or excitation transfer for selectively excited DAPs. For the well-known tetrahedral (T{sub D}) Ag{sub Cd} acceptor, the energies of four excited states are measured, and the values obtained are shown to be in perfect agreement with the previous data. Moreover, splitting between the 2P{sub 3/2} (Γ{sub 8}) and 2S{sub 3/2} (Γ{sub 8}) states is clearly observed for Ag{sub Cd} centers located at a short distance (5–7 nm) from a hydrogen-like donor (Cl{sub Te}). This splitting results from the reduction of the T{sub D} symmetry taking place when the acceptor is a member of a donor–acceptor pair. For the Cl-related complex acceptor with an activation energy of ∼121 meV (A-center), the energies of eight excited states are measured. It is shown that this defect produces low-symmetry central-cell correction responsible for the strong splitting of S-like T{sub D} shells. The energy spectrum of the Bi-related shallow acceptor with an activation energy of ∼36 meV is measured as well. The spectrum obtained differs drastically from the hydrogen-like set of levels, which indicates the existence of repulsive low-symmetry perturbation of the hydrogen-like Coulomb potential. It is also shown that the spectra of selectively excited PL recorded for a macroscopic ensemble of distant donor–acceptor pairs allow one to detect the low symmetry of acceptors of a given type caused by their complex nature or by the Jahn–Teller distortion. This method does not require any additional (external) field and is applicable to acceptors in diverse zinc-blende compound semiconductors.},
doi = {10.1063/1.4941026},
url = {https://www.osti.gov/biblio/22494992}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 5,
volume = 119,
place = {United States},
year = {2016},
month = {2}
}