1. Center for Molecular Systems & Organic Devices (CMSOD) Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications Nanjing 210023 China
2. Department of Chemistry National University of Singapore Singapore 117543 Singapore
3. Institute of Materials Research and Engineering Agency for Science Technology and Research Singapore 138634 Singapore
4. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing 211816 China
5. Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering Northwestern Polytechnical University Xi'an 710072 China
6. Physical Science Division IBM Thomas J. Watson Research Center 1101 Kitchawan Rd Yorktown Heights NY 10598 USA
7. Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Fuzhou 350207 China