1. Institute of Functional Nano & Soft Materials; Laboratory (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices; Soochow University; Suzhou 215123 PR China
2. Center of Super-Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Science; City University of Hong Kong; Hong Kong SAR PR China
3. Nano-organic Photoelectronic Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials; Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Beijing 100190 PR China