1. Shenzhen Key Laboratory
for Printed Organic Electronics, Department of Materials
Science and Engineering, South University of Science and Technology of China (SUSTC), No. 1088, Xueyuan Road, Shenzhen, Guangdong 518055, China
2. Department
of Chemistry and the Materials Research Center, the Argonne-Northwestern
Solar Energy Research Center, Northwestern University, 2145 Sheridan
Road, Evanston, Illinois 60208, United States
3. Chemical
Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
4. Department
of Graphic Arts Information Engineering, Pukyong National University, 365 Sinseon-ro, Nam-gu, Busan 48547, Republic of Korea