1. National-Local Joint Engineering Laboratory of New Energy Photovoltaic Devices, Key Laboratory of Optoelectronic Information Materials of Hebei Province, Key Laboratory of Digital Medical Engineering of Hebei Province, College of Electron and Information Engineering, Hebei University
2. Baoding 071002
3. P. R. China
4. Institute of Semiconductors, Chinese Academy of Science
5. Beijing 100083
6. China