Competition between band gap and yellow luminescence in undoped GaN grown by MOVPE on sapphire substrate

被引:26
|
作者
Xu, HZ [1 ]
Bell, A
Wang, ZG
Okada, Y
Kawabe, M
Harrison, I
Foxon, CT
机构
[1] Univ Tsukuba, Inst Appl Phys, Tsukuba, Ibaraki 3058573, Japan
[2] Chinese Acad Sci, Inst Semicond, Lab Semicond Mat Sci, Beijing 100083, Peoples R China
[3] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England
[4] Univ Nottingham, Sch Elect & Elect Engn, Nottingham NG7 2RD, England
基金
中国国家自然科学基金;
关键词
gallium nitride; metalorganic vapor-phase epitaxy; photoluminescence; yellow luminescence;
D O I
10.1016/S0022-0248(00)00927-1
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Undoped GaN epilayer on c-face (0 0 0 1) sapphire substrate has been grown by metalorganic vapor-phase epitaxy (MOVPE) in a horizontal-type low-pressure two-channel reactor. Photoluminescence (PL) as a function of temperature and excitation intensity have been systematically studied, and the competition between near band gap ultraviolet (UV) and defect-related yellow luminescence (YL) has been extensively investigated, It is revealed that the ratio of the UV-to-YL peak intensities depends strongly on the excitation intensity and the measurement temperature. The obtained results have been analyzed in comparison with the theoretical predications based on a bimolecular model. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:96 / 103
页数:8
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