Electrical-optical analysis of a GaN/sapphire LED chip by considering the resistivity of the current-spreading layer

Jyh Chen Chen, Gwo Jiun Sheu, Farn Shiun Hwu, Hsueh I. Chen, Jinn-Kong Sheu, Tsung Xian Lee, Ching Cherng Sun

研究成果: Article同行評審

18 引文 斯高帕斯(Scopus)

摘要

The effects of current distribution in LED chips on the electrical potential and optical light extraction efficiency are investigated by a numerical simulation. The results show that when the resistivity of the current-spreading layer is decreased there is current-crowding near the n-contact. On the other hand, when the resistivity in the current-spreading layer increases, there is current-crowding near the p-contact. When the current is crowded near the n-contact due to less resistivity of the current-spreading layer, the input power is lower because of the smaller series resistance in the chip, and the light extraction efficiency is higher since the shadowing effect of the p-contact can be avoided. For L p = 50 μm in this study, the light extraction efficiency at ρ ITO = 0.1 × 10 -3 Ω•cm is 1.4 times better than that when L p = 100 μm, even though the driving voltage is raised 1.02 times.

原文English
頁(從 - 到)213-215
頁數3
期刊Optical Review
16
發行號2
DOIs
出版狀態Published - 2009 三月 1

All Science Journal Classification (ASJC) codes

  • 原子與分子物理與光學

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