1. Key
Laboratory of Environmentally Friendly Chemistry and Applications
of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, P. R. China
2. Department
of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic
Materials, Wuhan University, Wuhan 430072, P. R. China
3. Michael
Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory
for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430072, P. R. China