1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, No. 3688 Nanhai Avenue, Nanshan
District, Shenzhen 518060, Guangdong, P. R. China
2. Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstrasse 7, Erlangen 91058, Germany
3. Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (HIERN), Immerwahrstr. 2, Erlangen 91058, Germany
4. National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, No. 3688 Daxue Avenue, Zhengzhou 450002, Henan, P. R. China
5. Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan