1. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM); National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM); Nanjing Tech University (NanjingTech); 30 South Puzhu Road Nanjing 211816 China
2. Division of Physics and Applied Physics; School of Physical and Mathematical Sciences; Nanyang Technological University; 637371 Singapore
3. School of Materials Science and Engineering; Harbin Institute of Technology at Weihai; Weihai 264209 China
4. Key Laboratory of Materials and Technology for Clean Energy; Ministry of Education; Key Laboratory of Advanced Functional Materials; Xinjiang University; Urumqi 830011 China
5. Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials (IAM); Nanjing University of Posts & Telecommunications; Nanjing 210023 Jiangsu China
6. Department of Physics; Faculty of Science; National University of Singapore; 117542 Singapore