Abstract We investigate the polarization-induced doping in the gradient variation of Al composition in the p-AlGaN/AlGaN hole injection layer (HIL) for deep ultraviolet light-emitting diodes (DUV-LEDs) with an ultra-thin p-GaN (4 nm) ohmic contact layer capable of emitting 277 nm. The experimental results show that the external quantum efficiency (EQE) and wall plug efficiency (WPE) of the structure graded from 0.75 to 0.55 in the HIL reach 5.49% and 5.04%, which are improved significantly by 182% and 209%, respectively, compared with the structure graded from 0.75 to 0.45, exhibiting a tremendous improvement. Both theoretical speculations and simulation results support that the larger the difference between 0.75 and in the HIL, the higher the hole concentration that should be induced; thus, the DUV-LED has a higher internal quantum efficiency (IQE). Meanwhile, as the value of decreases, the absorption of the DUV light emitted from the active region by the HIL is enhanced, reducing the light extraction efficiency (LEE). The IQE and LEE together affect the EQE performance of DUV-LEDs. To trade off the contradiction between the enhanced IQE and decreased LEE caused by the decrease in Al composition, the Al composition in the HIL was optimized through theoretical calculations and experiments.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62104085) and the Innovation/Entrepreneurship Program of Jiangsu Province, China (Grant No. JSSCTD202146).
Corresponding Authors:
Quan-Jiang Lv, Jun-Lin Liu
E-mail: lvquanjiang@ujs.edu.cn;liujunlin@ujs.edu.cn
Cite this article:
Yi-Wei Cao(曹一伟), Quan-Jiang Lv(吕全江), Tian-Peng Yang(杨天鹏), Ting-Ting Mi(米亭亭),Xiao-Wen Wang(王小文), Wei Liu(刘伟), and Jun-Lin Liu(刘军林) Realization of high-efficiency AlGaN deep ultraviolet light-emitting diodes with polarization-induced doping of the p-AlGaN hole injection layer 2023 Chin. Phys. B 32 058503
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