1. Key Laboratory of Advanced Semiconductor Devices and Materials, School of Electronic Engineering, Xi’an University of Posts & Telecommunications, Xi’an 710121, Shaanxi, China
2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
3. National Key Discipline Laboratory of Wide Band-gap Semiconductor, Xidian University, Xi'an 710071, Shaanxi, China