1. Photonics Laboratory, Physics Unit, Tampere University, Korkeakoulunkatu 3, 33720, Tampere, Finland
2. Hybrid Solar Cells, Faculty of Engineering and Natural Sciences, Tampere University, P.O. Box 541, FI-33014 Tampere, Finland
3. Centre for Analysis and Synthesis, Lund University, P.O. Box 124, 22100 Lund, Sweden
4. Wallenberg Initiative Materials Science for Sustainability, Department of Chemistry, Lund University, 22100 Lund, Sweden