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Performance improvement of blue InGaN light-emitting diodes with a specially designed n-AlGaN hole blocking layer |
Ding Bin-Bin (丁彬彬)a b, Zhao Fang (赵芳)a b, Song Jing-Jing (宋晶晶)a b, Xiong Jian-Yong (熊建勇)a b, Zheng Shu-Wen (郑树文)a b, Zhang Yun-Yan (张运炎)a b, Xu Yi-Qin (许毅钦)a b, Zhou De-Tao (周德涛)a b, Yu Xiao-Peng (喻晓鹏)a b, Zhang Han-Xiang (张瀚翔)a b, Zhang Tao (张涛)a b, Fan Guang-Han (范广涵)a b |
a Institute of Opto-Electronic Materials and Technology, South China Normal University, Guangzhou 510631, China;
b Laboratory of Nanophotonic Functional Materials and Device, South China Normal University, Guangzhou 510631, China |
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Abstract Blue InGaN light-emitting diodes (LEDs) with a conventional electron blocking layer (EBL), a common n-AlGaN hole blocking layer (HBL), and an n-AlGaN HBL with gradual Al composition are investigated numerically, which involves analyses of the carrier concentration in the active region, energy band diagram, electrostatic field, and internal quantum efficiency (IQE). The results indicate that LEDs with an n-AlGaN HBL with gradual Al composition exhibit better hole injection efficiency, lower electron leakage, and a smaller electrostatic field in the active region than LEDs with a conventional p-AlGaN EBL or a common n-AlGaN HBL. Meanwhile, the efficiency droop is alleviated when an n-AlGaN HBL with gradual Al composition is used.
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Received: 23 October 2012
Revised: 09 January 2013
Accepted manuscript online:
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PACS:
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85.60.Jb
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(Light-emitting devices)
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85.30.-z
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(Semiconductor devices)
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87.15.A-
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(Theory, modeling, and computer simulation)
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78.60.Fi
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(Electroluminescence)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61176043), the Special Funds for Provincial Strategic and Emerging Industries Projects of Guangdong Province, China (Grant Nos. 2010A081002005, 2011A081301003, and 2012A080304016), and the Youth Foundation of South China Normal University (Grant No. 2012KJ018). |
Corresponding Authors:
Fan Guang-Han
E-mail: gfan@scnu.edu.cn
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Cite this article:
Ding Bin-Bin (丁彬彬), Zhao Fang (赵芳), Song Jing-Jing (宋晶晶), Xiong Jian-Yong (熊建勇), Zheng Shu-Wen (郑树文), Zhang Yun-Yan (张运炎), Xu Yi-Qin (许毅钦), Zhou De-Tao (周德涛), Yu Xiao-Peng (喻晓鹏), Zhang Han-Xiang (张瀚翔), Zhang Tao (张涛), Fan Guang-Han (范广涵) Performance improvement of blue InGaN light-emitting diodes with a specially designed n-AlGaN hole blocking layer 2013 Chin. Phys. B 22 088503
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