Optical properties of nanostructures self-organized in CdSe ZnSe fractional monolayer superlattices

被引：2
作者：
Toropov, AA
Shubina, TV
Sorokin, SV
Sedova, IV
Sitnikova, AA
Ivanov, SV
Karlsteen, M
Willander, M
Bergman, JP
Pozina, GR
Monemar, B
机构：
[1] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
[2] Chalmers Univ Technol, Dept Microelect & Nanosci, S-41296 Gothenburg, Sweden
[3] Univ Gothenburg, S-41296 Gothenburg, Sweden
[4] Linkoping Univ, S-58183 Linkoping, Sweden
来源：
JOURNAL OF CRYSTAL GROWTH | 1999年 / 201卷
基金：
俄罗斯基础研究基金会;
关键词：
ZnSe CdSe; superlattice; hot excitons; localization; nanostructures;
D O I：
10.1016/S0022-0248(99)00030-5
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
We report on optical studies of excitonic transfer and localization in a CdSe/ZnSe fractional monolayer superlattice with an embedded deeper ZnCdSe quantum well (QW). Time-resolved selective excitation photoluminescence measurements reveal a two-step nature of the energy relaxation process. The first stage includes hot-exciton cascade relaxation assisted by emission of ZnSe LO phonons, which results in the formation of a narrow nonthermal distribution of free excitons. Different mechanisms compete to destroy the distribution, including optical- and acoustic-phonon-assisted exciton localization by fluctuations of the random potential, as well as tunneling escape of hot free excitons towards the embedded deeper QW in the sample. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：1231 / 1234
页数：4
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