1. Center
for Advanced Photovoltaics, Department of Electrical Engineering and
Computer Science, South Dakota State University, Brookings, South Dakota 57007, United States
2. 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, China