**Author details**

Weidong Zhu\*, Jingjing Chang, Chunfu Zhang\*, Jincheng Zhang and Yue Hao

\*Address all correspondence to: wdzhu@xidian.edu.cn and cfzhang@xidian.edu.cn

Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi'an, PR China

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