Juan Bisquert1, Peter Cendula2, Luca Bertoluzzi1, Sixto Gimenez1. 1. †Photovoltaics and Optoelectronic Devices Group, Departament de Fı́sica, Universitat Jaume I, 12071 Castelló, Spain. 2. ‡Institute of Computational Physics, Zurich University of Applied Sciences (ZHAW), Wildbachstrasse 21, 8401 Winterthur, Switzerland.