1Department of Chemistry, Capital Normal University, Beijing 100048, China
2Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing, 100871, China
3Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
4Heeger Beijing Research and Development Center, School of Chemistry and Environment, Beihang University, Beijing, 100191, China
5State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University. Xi’an 710049, China
6School
of Chemistry and Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States