STRAIN RELAXATION IN INGAAS/GAAS QUANTUM-WELLS GROWN ON GAAS (111)A SUBSTRATES

被引：3
|
作者：
VACCARO, PO
TAKAHASHI, M
FUJITA, K
WATANABE, T
机构：
来源：
JOURNAL OF CRYSTAL GROWTH | 1995年 / 150卷 / 1-4期
关键词：
D O I：
10.1016/0022-0248(94)00894-9
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
We have grown In0.2Ga0.8As strained quantum wells (SQWs) on GaAs (111)A just and off-angled substrates by molecular beam epitaxy (MBE). The photoluminescence (PL) peak energy of SQWs grown on (111)A related substrates shows a large redshift as compared with the calculated values. The red-shift observed in SQWs grown on a (111)A 5 degrees off toward [001] substrate can be explained by the presence of a built-in electric field E = 154 kV/cm due to piezoelectric effect. The larger red-shift observed in samples grown on the other substrates is partially due to strain relaxation. A strain relaxation mechanism that consists of coherently grown islands when InGaAs growth begins and the generation of misfit dislocations when these islands coalesce, gives a qualitative explanation of the observed results,
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页码：503 / 507
页数：5
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