1. Institute for Photovoltaics (ipv), University of Stuttgart, Pfaffenwaldring 47, D-70569 Stuttgart, Germany
2. State Key Laboratory of Silicon and Advanced Semiconductor Materials, International Research Center for X Polymers, Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
3. Institute for Materials Science, University of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart, Germany
4. Helmholtz Young Investigator Group FRONTRUNNER, IEK5-Photovoltaics Forschungszentrum Jülich, 52425 Jülich, Germany
5. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, China
6. Key Lab for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology, School of Materials Science and Engineering, Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng 475004, China