1. School of Materials Science and Engineering
2. Shaanxi Normal University
3. Xian 710119
4. People's Republic of China
5. State Key Laboratory of Polymer Physics and Chemistry
6. Changchun Institute of Applied Chemistry
7. Chinese Academy of Sciences
8. Changchun 130022
9. Materials Science and Engineering
10. Division of Physical Sciences and Engineering
11. Solar and Photovoltaic Engineering Research Center (SPERC)
12. King Abdullah University of Science and Technology (KAUST)
13. Thuwal