1. Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University Shenzhen 518060 P. R. China
2. Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction Hong Kong University of Science and Technology (HKUST) Clear Water Bay, Kowloon Hong Kong P. R. China
3. Department of Physics Chinese University of Hong Kong New Territories Hong Kong 999077 P. R. China
4. State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
5. eFlexPV Limited (China) Plant B701 Guofu Cultural Creative Industry Plant Area No. 16, Lanjing Middle Road, Zhukeng Community, Longtian Street, Pingshan District Shenzhen 518057 P. R. China
6. eFlexPV Limited Flat/RM B, 12/F, Hang Seng Causeway Bay BLDG, 28 Yee Wo Street, Causeway Bay Hong Kong 999077 P. R. China
7. Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics Southern University of Science and Technology (SUSTech) No. 1088, Xueyuan Road Shenzhen Guangdong 518055 P. R. China
8. Department of Chemistry Wuhan University Wuhan 430072 P. R. China