journal article·2020-06-01Open access

Improving hole injection from p-EBL down to the end of active region by simply playing with polarization effect for AlGaN based DUV light-emitting diodes

Danyang Zhang, Chunshuang Chu, Kangkai Tian, Jianquan Kou, Wengang Bi, Yonghui Zhang, Zi-Hui Zhang

AIP Advances· Volume 10· Issue 6

Abstract

In this work, we simply take advantage of the polarization effect to efficiently improve the hole injection from the p-type electron blocking layer (p-EBL) to the end of the active region for AlGaN based deep ultraviolet light emitting diodes (DUV LEDs). By properly increasing the AlN composition of AlGaN quantum barriers, a smaller positive polarized charge density at the last quantum barrier/p-EBL interface can be obtained, which correspondingly leads to the suppressed hole depletion and the reduced hole blocking effect in the p-EBL. Meanwhile, we properly increase the quantum well thickness so that the polarized electric field can even more accelerate the holes, and this will homogenize the hole distribution more across the MQWs. Therefore, the external quantum efficiency for DUV LEDs can be enhanced.
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Research context

OpenAlex topics: GaN-based semiconductor devices and materials · Ga2O3 and related materials · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Electronics and Information Engineering, Hebei University of Technology, Key Laboratory of Electronic Materials and Devices of Tianjin 1 , 5340 Xiping Road, Beihen District, Tianjin 300401, People’s Republic of China

State Key Laboratory of Reliability and Intelligence of Electrical Equipment 2 , 5340 Xiping Road, Beichen District, Tianjin 300401, People’s Republic of China

Funding

Program for Top 100 Innovative Talents in Colleges and Universities of Hebei Province · Program for 100-Talent-Plan of Hebei Province · Suzhou Institute of Nano-Tech and Nano-BionicsResearch Fund of Chinese Academy of Science · Natural Science Foundation of Hebei Province

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