1. Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon, Hong Kong 999077 P. R. China
2. Multiscale Crystal Materials Research Center Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China
3. Frontiers Science Center for Flexible Electronics Institute of Flexible Electronics Northwestern Polytechnical University Xi'an 710072 P. R. China
4. Center for Advanced Nuclear Safety and Sustainable Development City University of Hong Kong Kowloon, Hong Kong 999077 P. R. China
5. Hong Kong Institute for Clean Energy City University of Hong Kong Kowloon, Hong Kong 999077 Hong Kong
6. Centre for Functional Photonics City University of Hong Kong Kowloon, Hong Kong Hong Kong