1. SHU-SolarE R&D Lab; Department of Physics; College of Sciences Shanghai Key Laboratory of High Temperature Superconductors; Shanghai University; Shanghai 200444 China
2. State Key Laboratory of Surface Physics and Department of Physics Key Laboratory of Micro and Nano Photonic Structure (Ministry of Education); Fudan University; Shanghai 200433 China
3. Department of Electronic Information Materials; School of Materials Science and Engineering; Shanghai University; Shanghai 200444 China