1. Michael Grätzel Center for Mesoscopic Solar Cells
2. Wuhan National Laboratory for Optoelectronics
3. Huazhong University of Science and Technology
4. 430074 Wuhan, P. R. China
5. School of Materials Science and Engineering
6. Wuhan Textile University
7. Wuhan, P. R. China
8. Department of Materials Engineering
9. Monash University
10. Melbourne, Australia