Excitonic states and energy relaxation in low-dimension CdSe/ZnSe structures with isolated ZnCdSe islands

被引：10

作者：

Reznitsky, A. ^{[1
]}

Eremenko, M. ^{[1
]}

Sedova, I. V. ^{[1
]}

Sorokin, S. V. ^{[1
]}

Ivanov, S. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Ioffe Inst, St Petersburg 196140, Russia

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2015年 / 252卷 / 08期

基金：

俄罗斯科学基金会;

关键词：

CdSe self-assembled quantum dots; energy relaxation; excitons; II-VI compounds; CDSE QUANTUM DOTS; MOLECULAR-BEAM EPITAXY; ZNSE; SUPERLATTICES; WELLS; REORGANIZATION; FLUCTUATIONS; GROWTH; LAYERS;

D O I：

10.1002/pssb.201451728

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Photoluminescence (PL) and PL excitation (PLE) spectra of structures containing MBE-grown CdSe layers with a nominal thickness t(CdSe) of 1.4-2.7 monolayers (MLs) in a ZnSe matrix have been studied. It is shown that the main features of the PLE spectra in structures with different amounts of deposited CdSe can be described in terms of two different models: in structures with t(CdSe) exceeding approximately 1.7 ML, the properties of electronic states correspond to the frequently used model of the quantum well formed by an inhomogeneous ZnCdSe solid solution with nanosize inclusions constituted by planar ZnCdSe islands whose composition is strongly enriched with CdSe, whereas the properties of electronic states in structures with t(CdSe) < 1.6 ML can be described in the model of isolated uncoupled ZnCdSe nanoislands. It was found that the main channel by which emitting states are occupied under excitation with photons in a wide energy range both in the region of quantum-dot states and in that of free states in the ZnSe barrier is the cascade relaxation of hot excitons, with emission of longitudinal optical phonons. Other properties of electronic states in nano-objects of this kind are discussed. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：1717 / 1724

页数：8

共 41 条

[1] Galitskiy V. M., 2011, PROBLEMS QUANTUM MEC
[2] Structural and optical optimization of ZnSe-based laser heterostructures with graded index waveguide
Gronin, S. V.
Sedova, I. V.
Sorokin, S. V.
Klimko, G. V.
Belyaev, K. G.
Lebedev, A. V.
Sitnikova, A. A.
Toropov, A. A.
Ivanov, S. V.
[J]. PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 8-9, 2012, 9 (8-9): : 1833 - 1836
[3] Hommel D, 1997, PHYS STATUS SOLIDI B, V202, P835, DOI 10.1002/1521-3951(199708)202:2<835::AID-PSSB835>3.0.CO
[4] 2-C
[5] Growth and excitonic properties of single fractional monolayer CdSe/ZnSe structures
Ivanov, SV
Toropov, AA
Shubina, TV
Sorokin, SV
Lebedev, AV
Sedova, IV
Kop'ev, PS
Pozina, GR
Bergman, JP
Monemar, B
[J]. JOURNAL OF APPLIED PHYSICS, 1998, 83 (06) : 3168 - 3171
[6] Evidence for 2D precursors and interdiffusion in the evolution of self-assembled CdSe quantum dots on ZnSe
Kim, CS
Kim, M
Furdyna, JK
Dobrowolska, M
Lee, S
Rho, H
Smith, LM
Jackson, HE
James, EM
Xin, Y
Browning, ND
[J]. PHYSICAL REVIEW LETTERS, 2000, 85 (05) : 1124 - 1127
[7] Temperature dependence of photoluminescence bands in Zn1-xCdxSe/ZnSe quantum wells with planar CdSe islands -: art. no. 085308
Klochikhin, A
Reznitsky, A
Dal Don, B
Priller, H
Kalt, H
Klingshirn, C
Permogorov, S
Ivanov, S
[J]. PHYSICAL REVIEW B, 2004, 69 (08)
[8] Exciton states and spin relaxation in CdSe/ZnSe self-organized quantum dots
Klochikhin, A.
Reznitsky, A.
Permogorov, S.
Tsitsishvili, E.
Von Baltz, R.
Kalt, H.
Klingshirn, C.
[J]. SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 2008, 23 (11)
[9] Suppression of lateral fluctuations in CdSe-based quantum wells
Kurtz, E
Schmidt, M
Baldauf, M
Wachter, S
Grün, M
Kalt, H
Klingshirn, C
Litvinov, D
Rosenauer, A
Gerthsen, D
[J]. APPLIED PHYSICS LETTERS, 2001, 79 (08) : 1118 - 1120
[10] Broadening of submonolayer CdSe sheets in CdSe ZnSe superlattices studied by x-ray diffraction
Kyutt, RN
Toropov, AA
Sorokin, SV
Shubina, TV
Ivanov, SV
Karlsteen, M
Willander, M
[J]. APPLIED PHYSICS LETTERS, 1999, 75 (03) : 373 - 375

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