1. New Energy Technologies Group; Department of Applied Physics; Aalto University; P.O. BOX 15100 FI-00076 Aalto (Espoo) Finland
2. Solaronix SA; Rue de l' Ouriette 129 CH-1170 Aubonne Switzerland
3. Laboratory of Photonics and Interfaces; Ecole Polytechnique Federale de Lausanne (EPFL); CH G1 551, Station 6 CH-1015 Lausanne Switzerland
4. Department of Forest Products Technology Aalto University School of Chemical Technology; 16300, FI00076 Vuorimiehentie 1 Espoo Finland
5. Department of Mechanical Engineering Aalto University School of Engineering; 14100, FI-00076 Otakari 4 (K1), 02150 Espoo Finland