1. Organic Chemistry and Physical Chemistry, Center of Molecular Devices, Department of Chemistry, KTH Chemical Science and Engineering, 10044 Stockholm, Sweden, Department of Materials Chemistry, Ångström Laboratory, Uppsala University, Box 538, 75121 Uppsala, Sweden, and DUT-KTH Joint Education and Research Center of Molecular Devices, State Key Laboratory of Fine Chemicals, Dalian University of Technology (DUT), 116012 Dalian, China