Stacking-fault-induced pairs of localizing centers in ZnSe quantum wells

被引:2
作者
Lüerssen, D
Bleher, R
Kalt, H
Richter, H
Schimmel, T
Rosenauer, A
Litvinov, D
Kamilli, A
Gerthsen, D
Jobst, B
Ohkawa, K
Hommel, D
机构
[1] Univ Karlsruhe, Inst Angew Phys, D-76128 Karlsruhe, Germany
[2] Univ Karlsruhe, Lab Elektronenmikroskopie, D-76128 Karlsruhe, Germany
[3] Univ Bremen, Inst Festkorperphys, D-28334 Bremen, Germany
关键词
ZnSe/ZnMgSSe; quantum wells; stacking faults; microphotoluminescence; TEM; AFM;
D O I
10.1016/S0022-0248(00)00168-8
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Pairs of bright spots are observed in microphotoluminescence intensity maps of ZnSe/ZnMgSSe quantum-well structures. These pairs are exactly aligned parallel to the [110] or [(1) over bar 10] directions. Atomic-force microscopy and plan-view transmission electron microscopy reveal that the bright emission spots are related to pairs of stacking faults. The enhanced radiative recombination is a result of exciton localization in the region where the stacking faults intersect the quantum wells. Cross-section transmission electron microscopy and microphotoluminescence spectroscopy show that in the case of Frank-type stacking faults (oriented along [110]) the wells are enlarged by up to 12 bilayers. The exciton localization is much shallower in the case of Shockley-type stacking-fault pairs (oriented along [(1) over bar 10]). (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:634 / 638
页数:5
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