Effect of thickness of the p-AlGaN electron blocking layer on the improvement of ESD characteristics in GaN-based LEDs

被引:41
作者
Jang, Chung-Hsun [1 ,2 ]
Sheu, J. K. [3 ,4 ]
Tsai, C. M. [1 ,2 ]
Shei, S. C. [5 ]
Lai, W. C. [3 ,4 ]
Chang, S. J. [1 ,2 ]
机构
[1] Natl Cheng Kung Univ, Inst Microelect, Tainan 70101, Taiwan
[2] Natl Cheng Kung Univ, Dept Elect Engn, Tainan 70101, Taiwan
[3] Natl Cheng Kung Univ, Adv Optoelect Technol Ctr, Tainan 70101, Taiwan
[4] Natl Cheng Kung Univ, Inst Electroopt Sci & Engn, Tainan 70101, Taiwan
[5] Natl Univ Tainan, Dept Elect Engn, Tainan 700, Taiwan
关键词
AlGaN; electron blocking layer (EBL); electrostatic discharge (ESD); GaN light-emitting diode (LED);
D O I
10.1109/LPT.2008.924886
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The following letter presents a study regarding GaN-based light-emitting diodes (LEDs) with p-type AlGaN electron blocking layers (EBLs) of different thicknesses. The study revealed that the LEDs could endure higher electrostatic discharge (ESD) levels as the thickness of the AlGaN EBL increased. The observed improvement in the ESD endurance ability could be attributed to the fact that the thickened p-AlGaN EBL may partly fill the dislocation-related pits that occur on the surface of the InGaN-GaN multiple-quantum well (MQW) and that are due to the strain and the low-temperature-growth process. If these dislocation-related pits are not partly suppressed, they will eventually result in numerous surface pits associated with threading dislocations that intersect the InGaN-GaN (MQW), thereby reducing the ESD endurance ability. The results of the experiment show that the ESD endurance voltages could increase from 1500 to 6000 V when the thickness of the p-AlGaN EBL in the GaN LEDs is increased from 32.5 to 130 nm, while the forward voltages and light output powers remained almost the same.
引用
收藏
页码:1142 / 1144
页数:3
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