1. Microelectronics Research Unit, Faculty of Information Technology & Electrical Engineering, University of Oulu, P. O. Box 4500, FI-90014, Finland
2. Optoelectronics and Measurement Techniques Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
3. Nano and Molecular Systems Research Unit, University of Oulu, Finland
4. Institute of Photoelectronic Thin Film Devices and Technology, Solar Energy Research Center, Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300350, China
5. Laboratory of Nanotechnology and Solar Energy, Chemistry Institute, University of Campinas – UNICAMP, P. O. Box 6154, 13083-970 Campinas, SP, Brazil
6. SPECIFIC, College of Engineering, Baglan Bay Innovation and Knowledge Centre, Swansea University, Baglan SA12 & AX, UK