GaN基LED的图形衬底优化研究  

An Optimization of Patterned Sapphire Substrate for GaN-based LEDs

作　　者：范玉佩[1] 曾祥华[2] 顾长华[1] 刘宝琴 王坚[1] 张乾[1] 

机构地区：[1]江海职业技术学院,江苏扬州225101 [2]扬州大学物理科学与技术学院,江苏扬州225002 [3]扬州璨扬光电有限公司,江苏扬州225009

出　　处：《光电子技术》2013年第4期265-269,共5页Optoelectronic Technology

基　　金：中国博士后科学基金资助项目(20080430096)

摘　　要：设计了方形和阶梯状两大类的图形化蓝宝石衬底(PSS),使用Crosslight公司的工艺软件CSuprem建立了三维的方形和阶梯状两类图形衬底GaN LED器件,然后使用APSYS软件模拟计算出它们的光电特性。并且对方形图形衬底的刻蚀深度进行了优化,通过对模拟结果的比较得到刻蚀深度与边长的比值为0.4时,这种方形图形衬底GaN LED的光提取效率最高,且比平面衬底提高了20.13%。对阶梯状图形衬底的阶梯层数进行了比较,发现随着阶梯层数的增加,光提取效率也随着增加,阶梯状层数为5时,光提取效率比平面衬底提高了30.03%。并对方形PSS LED进行了实验验证。The CSuprem software is applied to help fabricate three-dimensional GaN LED with patterned sapphire substrate （PSS） and the photoelectric characteristics of these GaN LEDs are simulated with APSYS. The ＇square-type＇ patterned sapphire substrate and the ＇step-type＇ patterned sapphire substrate are designed and optimized. For ＇square-type＇ patterned sapphire substrate, the depth of etching is optimized. The light extraction efficiency of GaN LED with this kind of patterned sapphire substrate is highest when the aspect ratio is 0.4, and the light extrac- tion efficiency is improved 20. laM compared with that of GaN LED with conventional sapphire substrate （CSS）. For ＇step-type＇ patterned sapphire substrate, the number of step is optimized. The light extraction efficiency will increase with the number of steps, and the light extraction ef- ficiency is improved 30.03^ compared with that of GaN LED with conventional sapphire sub-strate （CSS）. At last, the experiment is conducted for the ＇square-type~ patterned sapphire sub- strate demonstration.

关 键 词：氮化镓 发光二极管 极化效应 图形衬底 光提取效率 

分 类 号：TN312.8[电子电信—物理电子学]