1. Institut National de la Recherche Scientifique, Centre-Énergie Matériaux et Télécommunications, Université du Québec; Varennes QC, J3X 1S2 Canada
2. Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University; Suzhou 215123 China
3. Center for Advanced Photovoltaics, Electrical Engineering and Computer Science Department, South Dakota State University; Brookings SD 57007 USA
4. Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied Physics, Chinese Academy of Sciences; 239 Zhangheng Road, Pudong New Area Shanghai 201204 China
5. Department of Electrical Engineering, École de technologie supérieure, Université du Québec 1100; rue Notre-Dame Ouest H3C 1K3, Montréal (Québec) Canada