1. Elektrizitatea eta Elektronika Saila, UPV/EHU, 644.48080 Bilbao, Spain
2. Fisika Aplikatua II Saila, UPV/EHU, 644.48080 Bilbao, Spain
3. BC Materials (Basque Center for Materials, Application and Nanostructures), 48040 Leioa, Spain
4. Laboratoire de Chimie des Polymères Organiques, UMR 5629 CNRS/Université de Bordeaux, 33607 Pessac, France