1. School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China (UESTC) Chengdu 610054 China
2. Institute of Flexible Electronics (IFE) Northwestern Polytechnical University (NPU) Xi'an 710072 China
3. Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Avenida da Universidade Macau 999078 China
4. Institute of Solar Energy Materials and Devices College of Materials Science and Engineering Sichuan University Chengdu 610065 China