1. Engineering Research Center of Thin Film Solar Cell Materials and Devices, Hebei Province, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, Hebei 050024, China
2. School of Materials Science and Engineering, Institute of Materials for Energy Conversion, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
3. Faculty of Engineering, Shenzhen MSU-BIT University, Shenzhen, 518172, China