LED以GaN材料為主,一般使用InGaN製作量子井來增加電子電洞對的複合率提升LED的效率,可是InGaN材料會使得晶格品質下降造成內部量子效率下降,所以我們試著使用gradient-stage 結構來改善我們主動層的晶格品質。 c-plane GaN系列LED會產生內建電場的情形,稱為量子侷限史坦克效應(Quantum Confine Stark Effect,QCSE),會影響減弱元件的發光效應。而a-plane為非極性面,可有效消除史坦克效應。另外P-GaN的活化也是一個很重要的課題,P-GaN活化可得到更高的電洞濃度(Hole Concentration),使得LED的發光效率得以提升。本論文以熱退火(Thermal annealing)方式來活化a-plane P極的GaN 。N2與O2做為活化所使用之氣體。
InGaN multiquantum well (MQW) generally was increased electron-hole pair injected into active region. InGaN is causing the crystalline quality and to decrease the internal quantum efficiency, so uses the gradient-stage construction to improve the crystalline quality. A internal electric field perpendicular in c-plane GaN-based led is Quantum Confine Stark Effect. it would result in lower light intensity. A-plane is nonpolar and will removed the Quantum Confine Stark Effect. And p-GaN is a important study. Activated the p-GaN to get high hole concentration, led’s light intensity would be better.In this thesis, we use thermal annealing to activate a-plane p-GaN. N2 and O2 is ambiance gas