中国物理B ›› 2016, Vol. 25 ›› Issue (8): 88505-088505.doi: 10.1088/1674-1056/25/8/088505
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
Ping Qin(秦萍), Wei-Dong Song(宋伟东), Wen-Xiao Hu(胡文晓), Yuan-Wen Zhang(张苑文), Chong-Zhen Zhang(张崇臻), Ru-Peng Wang(王汝鹏), Liang-Liang Zhao(赵亮亮), Chao Xia(夏超), Song-Yang Yuan(袁松洋), Yi-an Yin(尹以安), Shu-Ti Li(李述体), Shi-Chen Su(宿世臣)
Ping Qin(秦萍)1, Wei-Dong Song(宋伟东)1, Wen-Xiao Hu(胡文晓)1, Yuan-Wen Zhang(张苑文)1, Chong-Zhen Zhang(张崇臻)1, Ru-Peng Wang(王汝鹏)1, Liang-Liang Zhao(赵亮亮)1, Chao Xia(夏超)1, Song-Yang Yuan(袁松洋)1, Yi-an Yin(尹以安)1,2, Shu-Ti Li(李述体)1,2, Shi-Chen Su(宿世臣)1,2
摘要: We investigate the performances of the near-ultraviolet (about 350 nm-360 nm) light-emitting diodes (LEDs) each with specifically designed irregular sawtooth electron blocking layer (EBL) by using the APSYS simulation program. The internal quantum efficiencies (IQEs), light output powers, carrier concentrations in the quantum wells, energy-band diagrams, and electrostatic fields are analyzed carefully. The results indicate that the LEDs with composition-graded p-AlxGa1-xN irregular sawtooth EBLs have better performances than their counterparts with stationary component p-AlGaN EBLs. The improvements can be attributed to the improved polarization field in EBL and active region as well as the alleviation of band bending in the EBL/p-AlGaN interface, which results in less electron leakage and better hole injection efficiency, thus reducing efficiency droop and enhancing the radiative recombination rate.
中图分类号: (Light-emitting devices)