1. Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and Chemistry CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
2. University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Department of Physics and Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
4. Department of Composite Materials and Engineering College of Materials Science and Engineering Hebei University of Engineering Handan 056038 P. R. China
5. Department of Chemistry Korea University Seoul 136‐701 Republic of Korea
6. Beijing National Laboratory for Molecular Science Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
7. Advanced Light Source Lawrence Berkeley National Laboratory Berkeley CA 94720 USA