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题名: Optical Pr operties of GaNAs and GaAsSb Semiconductors
作者: Luo Xiangdong;  Xu Zhongying
发表日期: 2005
摘要: Under short pulse laser excitation, it has been observed, for the first time, a new high-energy photoluminescence emission from GaNx As1- x/GaAs SQWs. This new emission has totally different optical properties compared with the localized exciton transition in GaNx As1-x, and is attributed to the recombination of delocalized excitons in QWs. At the same time, a competition process between localized and delocalized exciton emissions in GaNx As1-x/GaAs quantum wells is observed in the temperaturedependent PL spectra under the short pulse excitation. This competition process for the first time, reveals the physical origin of the temperature-induced S-shaped PL peak shift, which was often reported in the disordered alloy semiconductor system under continuous-wave excitation and puzzled people for a long time. We have also investigated a set of GaNx As1- x samples with small nitrogen composition( x < 1% )by PL, and time-resolved PL. After the PL dependence on temperature and excitation power and PL dynamics were measured, the new PL peak was identified as an intrinsic transition of alloy, rather than N-related bound states. This is the first observation in PL, showing that alloy state exists in GaNx As1- x materials even when N composition is smaller than 0.1%. Finally by selective excitation,both type-Ⅰ and type-Ⅱ transitions were observed simultaneously in GaAs1-xSbx/GaAs SQWs for the first time.
刊名: 中国科学院研究生院学报
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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Luo Xiangdong;Xu Zhongying.Optical Pr operties of GaNAs and GaAsSb Semiconductors,中国科学院研究生院学报,2005,22(5):645-655
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