Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7940848 | Superlattices and Microstructures | 2017 | 12 Pages |
Abstract
Double peaks at wavelength of 276 and 290Â nm are observed for AlGaN/AlGaN multiple quantum wells (MQWs). Cathodoluminescence (CL) mappings identify that the emission at 290Â nm originates from the macrostep edges. Potential minima induced by local variation of QW thickness and Ga incorporation are found along the step edges, where quantum wires (QWRs) are formed. The lateral advance rate of macrostep (â¼310Â nm/h) is obtained by investigating the distribution of QWRs. Temperature-dependent CL spectrum suggest that thermal quenching for 290Â nm emission is dramatically suppressed compared with that for conventional QWs emission, which shows excitonic localization characteristics of QWRs.
Keywords
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Mengjun Hou, Zhixin Qin, Lisheng Zhang, Tianyang Han, Mingxing Wang, Fujun Xu, Xinqiang Wang, Tongjun Yu, Zheyu Fang, Bo Shen,