1. State Key Lab of Photovoltaic Science and Technology, Trina Solar, Changzhou, 213031, China
2. School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center for Photovoltaic Science and Engineering, Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology, Changzhou University, Changzhou, 213164, China
3. Institute of Photoelectronic Thin Film Devices and Technology of Nankai University, Tianjin 300071, China
4. Group for Molecular Engineering of Functional Materials Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Sion, CH-1951, Switzerland
5. Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio Avenue 3, LT-10257 Vilnius, Lithuania
6. Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland