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

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Title:	Electrical-optical analysis of a GaN/sapphire LED chip by considering the resistivity of the current-spreading layer
Authors:	Chen,JC;Sheu,GJ;Hwu,FS;Chen,HI;Sheu,JK;Lee,TX;Sun,CC
Contributors:	機械工程研究所
Keywords:	LIGHT-EMITTING-DIODES;EXTRACTION;DESIGN
Date:	2009
Issue Date:	2010-06-29 18:01:46 (UTC+8)
Publisher:	中央大學
Abstract:	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 mu m in this study, the light extraction efficiency at rho (ITO) = 0.1 x 10(-3) Omega center dot cm is 1.4 times better than that when L (p) = 100 mu m, even though the driving voltage is raised 1.02 times.
Relation:	OPTICAL REVIEW
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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