Spatially-resolved photoluminescence studies of V-shaped pits on Al0.16Ga0.84N
Autor: | C. S. Ku, H. Y. Lee, Wei-Kuo Chen, Hsiang-Jen Huang, Wei Hsin Chen, Wen-Cheng Ke, N. E. Tang, J. M. Peng, Ming Chih Lee |
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Rok vydání: | 2004 |
Předmět: | |
Zdroj: | Journal of Applied Physics. 95:2172-2174 |
ISSN: | 1089-7550 0021-8979 |
Popis: | We have studied optical properties of V-shaped pits on Al0.16Ga0.84N. The microphotoluminescence spectrum from the pit center shows a broader and stronger emission at 350 nm than the near-band-edge emission at 336 nm from nonpit regions. The results indicated specific defect levels associated with the V-shaped pits. Furthermore, after using atomic force microscopy to probe the surface electrical potential with a conductive tip, the pit’s potential was ∼0.2 V lower than its surrounding region. A simplified energy diagram is tentatively proposed to interpret our observation. |
Databáze: | OpenAIRE |
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