Dynamics of photoexcited carriers in AlxGa1-xN/GaN double heterostructures

被引:14
作者
Shan, W
Xu, S
Little, BD
Xie, XC
Song, JJ
Bulman, GE
Kong, HS
Leonard, MT
Krishnankutty, S
机构
[1] OKLAHOMA STATE UNIV,DEPT PHYS,STILLWATER,OK 74078
[2] CREE RES INC,DURHAM,NC 27713
[3] HONEYWELL TECHNOL CTR,PLYMOUTH,MN
关键词
D O I
10.1063/1.366101
中图分类号
O59 [应用物理学];
学科分类号
摘要
We present results of a time-resolved photoluminescence study of the dynamics of photoexcited carriers in AlxGa1-xN/GaN double heterostructures (DHs). The carrier dynamics including generation, diffusion, spontaneous recombination, and nonradiative relaxation were studied by examining the time decay of photoluminescence associated with the spontaneous recombination from the samples. The temporal evolution of the luminescence from the GaN active layers of the DH samples was found to be governed by a carrier-diffusion dominated capture process. The determination of the capture rime for the carriers drift and diffusion into the GaN active region, in addition to the effective lifetimes of the spontaneous recombination for carriers in the AlGaN cladding layers and the GaN active region, allows an estimation of the diffusion constants for the minority carriers in the AlxGa1-xN cladding layers of the DHs. Our results yield a diffusion constant of 2.6 cm(2)/s for Al0.03Ga0.97N and 1.5 cm(2)/s for Al0.1Ga0.9N at 10 K. (C) 1997 American Institute of Physics.
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收藏
页码:3158 / 3160
页数:3
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