1. Hefei National Laboratory for Physical Sciences at Microscale; Key Laboratory of Materials for Energy Conversion; Chinese Academy of Sciences; Department of Materials Science and Engineering; Synergetic Innovation Center of Quantum Information & Quantum Physics; University of Science and Technology of China (USTC); Hefei 230026 P. R. China
2. Key Laboratory of Novel Thin Film Solar Cells; Institute of Plasma Physics; Chinese Academy of Sciences; Hefei 230031 P. R. China