1. College of Physics and Electronic Information Engineering, Zhejiang Normal University, Jinhua 321004, Zhejiang China
2. Printable Electronics Research Center, Nano Devices and Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu China
3. pi-Conjugated Polymers Unit, Okinawa Institute of Science and Technology Graduate University, Kunigami-gun, Okinawa 904-0495, Japan