发光学报, 2016, 37 (3): 338, 网络出版: 2016-04-13
GaN基垂直结构LED的n型电极结构设计及芯片制备
n-type Electrode Patterns Design and Device Fabrication of GaN-based Vertical Structure LEDs
氮化镓 垂直结构发光二极管 电流分布 螺旋状环形结构电极 GaN vertical-structure light-emitting diodes(VS-LEDs) current distribution annulospiral electrode
摘要
首先利用电流路径模型分析n型电极尺寸及间距等对垂直结构发光二极管(VS-LEDs)电流分布均匀性的影响, 依此设计出一种螺旋状环形结构电极。其次, 通过建立有限元分析软件Comsol仿真模型模拟VS-LEDs有源层的电流密度分布, 发现螺旋状环形结构电极的环间距越小, 电流密度分布越均匀。最后, 利用VS-LEDs芯片制备技术实现具有螺旋状环形电极的垂直结构LED芯片。实验结果显示, 在350 mA电流驱动下, 电极环间距为146.25 μm的芯片具有最大的功能转换效率, 达到26.8%。
Abstract
The influences of size and spacing of n-type electrode on the current distribution of vertical-structure light-emitting diodes (VS-LEDs) were firstly analyzed by two-dimension circuit modeling, and annulospiral n-type electrodes were proposed for the fabrication of VS-LEDs. Then, finite element analysis model in Comsol Multiphysics was built to study the current density distribution in the active layer of VS-LEDs with the annulospiral electrodes. It is found that the current density distribution became more uniform when the electrode spacing reduced. Finally, VS-LEDs with various annulospiral electrodes were fabricated using high-reflectivity p-type Ohmic electrode, copper substrate electroplating and laser lift-off techniques. The wall plug efficiency of VS-LEDs with the electrode spacing of 146.25 μm is 26.8% at 350 mA, which is higher than that of VS-LEDs with other electrode spacings.
刘丽, 胡晓龙, 王洪. GaN基垂直结构LED的n型电极结构设计及芯片制备[J]. 发光学报, 2016, 37(3): 338. LIU Li, HU Xiao-long, WANG Hong. n-type Electrode Patterns Design and Device Fabrication of GaN-based Vertical Structure LEDs[J]. Chinese Journal of Luminescence, 2016, 37(3): 338.