Temperature-Dependent Optical Behaviors and Demonstration of Carrier Localization in Polar and Semipolar AlGaN Multiple Quantum Wells

被引:0
|
作者
Ouyang, Ping [1 ,2 ]
Liu, Kunzi [2 ]
Zhang, Jiaxin [2 ]
Chen, Qiushuang [2 ]
Deng, Liqiong [1 ,2 ]
Yan, Long [3 ]
Hoo, Jason [3 ]
Guo, Shiping [3 ]
Chen, Li [2 ]
Guo, Wei [2 ]
Ye, Jichun [2 ]
机构
[1] Ningbo Univ, Fac Mat Sci & Chem Engn, Ningbo 315211, Peoples R China
[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Engn Res Ctr Energy Optoelect Mat & Devic, Ningbo 315201, Peoples R China
[3] Adv Microfabricat Equipment Inc, Shanghai 201201, Peoples R China
基金
中国国家自然科学基金;
关键词
AlGaN MQWs; ultraviolet emitters; carrier localization; INGAN; PHOTOLUMINESCENCE; EMISSION; DYNAMICS; QUALITY; GROWTH; SHIFT; ALN;
D O I
10.3390/cryst13071076
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Semipolar AlGaN multiple quantum wells (MQWs) have unique advantages in deep ultraviolet light emitters due to the weak Quantum-Confined Stark Effect. However, their applications are hampered by the poor crystalline quality of semipolar AlGaN thin films. Different treatments were developed to improve the crystal quality of semipolar AlGaN, including a multistep in situ thermal annealing technique proposed by our group. In this work, temperature-dependent and time-resolved photoluminescence characterizations were performed to reveal the carrier localization in the MQW region. The degree of carrier localization in semipolar AlGaN MQWs grown on top of the in situ-annealed AlN is similar to that of conventional ex situ face-to-face annealing, both of which are significantly stronger than that of the c-plane counterpart. Moreover, MQWs on in situ-annealed AlN show drastically reduced dislocation densities, demonstrating its great potential for the future development of high-efficiency optoelectronic devices.
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页数:10
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