1. Henan Key Laboratory of Photovoltaic Materials
2. School of Physics and Electronics
3. Henan University
4. Kaifeng 475004
5. China
6. School of Materials Science and Engineering
7. Nanjing University of Science and Technology
8. Nanjing 210094
9. Institute of Solid State Physics
10. Key Lab of Materials Physics
11. CAS
12. Hefei 230031