* Corresponding authors

^a Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR 999077, China
E-mail: fwang24@cityu.edu.hk

^b College of Physics Science and Technology, Hebei University, Baoding, China

^c College of Electronic and Optical Engineering and College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
E-mail: bchen@njupt.edu.cn

^d Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China

^e Hong Kong Institute for Clean Energy, City University of Hong Kong, Kowloon, Hong Kong SAR 999077, China

^f Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China