supported by the National Key R&D Program of China (Grant Nos. 2017YFB0404100 and 2017YFB0403000);the National Natural Science Foundation of China (Grant No. 61704187);the Key Research Program of the Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSWSLH042)。
Separation technology is an indispensable step in the preparation of freestanding GaN substrate. In this paper, a largearea freestanding GaN layer was separated from the substrate by an electrochemical liftoff process...