High efficiency and improved ESD characteristics of GaN-Based LEDs with naturally textured surface grown by MOCVD

被引:64
作者
Tsai, C. M.
Sheu, J. K.
Wang, P. T.
Lai, W. C.
Shei, S. C.
Chang, S. J.
Kuo, C. H.
Kuo, C. W.
Su, Y. K.
机构
[1] Natl Cheng Kung Univ, Dept Elect Engn, Inst Microelect, Tainan 70101, Taiwan
[2] Natl Cheng Kung Univ, Adv Optoelect Technol Ctr, Inst Electroopt Sci & Engn, Tainan 70101, Taiwan
[3] Epitech Technol Corp, Hsin Shi 744, Taiwan
[4] Natl Cent Univ, Inst Opt Sci, Jhongli 320, Taiwan
关键词
electrostatic discharge (ESD); GaN light-emitting diode (LED); textured surfaces; V-shaped pits;
D O I
10.1109/LPT.2006.875063
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 paper presents a study on GaN-based light-emitting diodes (LEDs) with naturally textured surface grown by metal-organic chemical vapor deposition. The study utilizes a well-known approach of increasing light extraction efficiency. The approach is based on naturally formed V-shaped pits on surface that originate from low-temperature-growth (LTG) conditions of topmost p-GaN contact layer. In our experiment, the high-temperature-grown (HTG) p-GaN layer was inserted between the p-AlGaN electron-blocking layer and the LTG p-GaN contact layer, in order to suppress pit-related threading dislocations (TDs). These TDs may intersect the underlying active layer. The results of the experiment show that GaN-based LEDs with the HTG p-GaN insertion layer can effectively endure negative electrostatic discharge voltage of up to 7000 V. We also noted that application of 20-mA current injection yields output power of about 16 mW for the LEDs emitting around 465 nm. The output power results correspond to an external quantum efficiency of around 30%.
引用
收藏
页码:1213 / 1215
页数:3
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