1. State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
2. Key Laboratory of Information Materials of Sichuan Province, College of Electronic and Information, Southwest Minzu University, Chengdu 610041, China
3. College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, China