1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
2. Department
of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, U.K.
3. Micro-optoelectronic
Systems Laboratories, Xi’an Technological University, Xi’an 710032, Shaanxi, China
4. Guangxi
Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China
5. National
Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China