1. Multifunctional Optical Materials Group; Institute of Materials Science of Seville; Spanish National Research Council; University of Seville; Calle Américo Vespucio 49 41092 Seville Spain
2. Abengoa Research S. L.; Campus Palmas Altas; Calle Energía Solar 1 41014 Seville Spain
3. Division Flat and Flexible Products, Fraunhofer Institute for Organic Electronics; Electron Beam and Plasma Technology FEP; Winterberstrasse 28 01277 Dresden Germany