1. College of Engineering and Applied Science
2. Nanjing University
3. Nanjing 210093
4. P. R. China
5. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM)
6. Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
7. Nanjing Tech University (NanjingTech)
8. Nanjing 211816
9. Eco-materials and Renewable Energy Research Center (ERERC)
10. National Laboratory of Solid State Microstructures and Department of Physics