1. Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P. R. China
2. Tongwei Solar (Chengdu) Co., Ltd., Chengdu 610299, Sichuan, P. R. China
3. Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, School of Materials and Energy, Southwest University, Chongqing 400715, P. R. China