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Optical Study of Bandedge Blue-Shift in AlGaN/GaN Double Quantum Wells |
| YANG Kai;SHEN Bo;ZHANG Rong;ZHOU Yu-gang;CHEN Zhi-zhong;CHEN Peng;ZHENG You-dou;HUANG Zhen-chun1 |
| Department of Physics, Nanjing Universitx Nanjing 210093
1NASA Goddard Space Flight Center, Code 718, Greenbelt, MD 20771, USA
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| Cite this article: |
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YANG Kai, SHEN Bo, ZHANG Rong et al 1997 Chin. Phys. Lett. 14 708-711 |
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Abstract Optical properties of AlGaN/GaN double quantum wells grown by metalorganic chemical vapor deposition are investigated. The wide-angle and small angle x-ray diffraction spectra show high crystalline quality of the sample. Optical transmission and cathodoluminescence spectra exhibit that there is a blue shift of the energy bandedge in the AlGaN/GaN double quantum wells comparing to that of bulk GaN. The experimental data are compared to theoretical calculation based on the finite square well model and a confined particle transitions are identified. The observed energy shift which differs from calculated values of ground state electron to heavy hole transition is attributed to strain in the AlGaN/GaN system.
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78.66.Fd
78.40.Kc
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Published: 01 September 1997
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