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Title: Effect of heteroboundary spreading on the properties of exciton states in Zn(Cd)Se/ZnMgSSe quantum wells

Abstract

Exciton states in Zn(Cd)Se/ZnMgSSe quantum wells with different diffusion spreading of interfaces are studied by optical spectroscopy methods. It is shown that the emission spectrum of quantum wells at low temperatures is determined by free excitons and bound excitons on neutral donors. The nonlinear dependence of the stationary photoluminescence intensity on the excitation power density and the biexponential luminescence decay are explained by the neutralization of charged defects upon photoexcitation of heterostructures. With the stationary illumination on, durable (about 40 min) reversible changes in the reflection coefficient near the exciton resonances of quantum wells are observed. It is shown that, along with the shift of exciton levels, the spreading of heteroboundaries leads to three effects: an increase in the excitonphonon interaction, an increase in the energy shift between the emission lines of free and bound excitons, and a decrease in the decay time of exciton luminescence in a broad temperature range. The main reasons for these effects are discussed.

Authors:
; ; ; ; ;  [1]
  1. Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22069262
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 5; Other Information: Copyright (c) 2012 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; CADMIUM SELENIDES; DIFFUSION; EMISSION SPECTRA; EMISSION SPECTROSCOPY; EXCITATION; EXCITONS; HETEROJUNCTIONS; INTERFACES; NONLINEAR PROBLEMS; PHOTOLUMINESCENCE; QUANTUM WELLS; REFLECTION; RESONANCE; ZINC SELENIDES; ZINC SULFIDES

Citation Formats

Adiyatullin, A. F., E-mail: bert-sp@yandex.ru, Belykh, V. V., Kozlovsky, V. I., Krivobok, V. S., E-mail: krivobok@lebedev.ru, Martovitsky, V. P., and Nikolaev, S. N. Effect of heteroboundary spreading on the properties of exciton states in Zn(Cd)Se/ZnMgSSe quantum wells. United States: N. p., 2012. Web. doi:10.1134/S1063776112090014.
Adiyatullin, A. F., E-mail: bert-sp@yandex.ru, Belykh, V. V., Kozlovsky, V. I., Krivobok, V. S., E-mail: krivobok@lebedev.ru, Martovitsky, V. P., & Nikolaev, S. N. Effect of heteroboundary spreading on the properties of exciton states in Zn(Cd)Se/ZnMgSSe quantum wells. United States. doi:10.1134/S1063776112090014.
Adiyatullin, A. F., E-mail: bert-sp@yandex.ru, Belykh, V. V., Kozlovsky, V. I., Krivobok, V. S., E-mail: krivobok@lebedev.ru, Martovitsky, V. P., and Nikolaev, S. N. Thu . "Effect of heteroboundary spreading on the properties of exciton states in Zn(Cd)Se/ZnMgSSe quantum wells". United States. doi:10.1134/S1063776112090014.
@article{osti_22069262,
title = {Effect of heteroboundary spreading on the properties of exciton states in Zn(Cd)Se/ZnMgSSe quantum wells},
author = {Adiyatullin, A. F., E-mail: bert-sp@yandex.ru and Belykh, V. V. and Kozlovsky, V. I. and Krivobok, V. S., E-mail: krivobok@lebedev.ru and Martovitsky, V. P. and Nikolaev, S. N.},
abstractNote = {Exciton states in Zn(Cd)Se/ZnMgSSe quantum wells with different diffusion spreading of interfaces are studied by optical spectroscopy methods. It is shown that the emission spectrum of quantum wells at low temperatures is determined by free excitons and bound excitons on neutral donors. The nonlinear dependence of the stationary photoluminescence intensity on the excitation power density and the biexponential luminescence decay are explained by the neutralization of charged defects upon photoexcitation of heterostructures. With the stationary illumination on, durable (about 40 min) reversible changes in the reflection coefficient near the exciton resonances of quantum wells are observed. It is shown that, along with the shift of exciton levels, the spreading of heteroboundaries leads to three effects: an increase in the excitonphonon interaction, an increase in the energy shift between the emission lines of free and bound excitons, and a decrease in the decay time of exciton luminescence in a broad temperature range. The main reasons for these effects are discussed.},
doi = {10.1134/S1063776112090014},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 5,
volume = 115,
place = {United States},
year = {2012},
month = {11}
}