1. National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States,
2. Federal University of Sao Carlos, Road Washington Luiz, km 235, São Carlos, SP 13565-905, Brazil
3. Colorado School of Mines, 1500
Illinois Street, Golden, Colorado 80401, United States,
4. Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Hahn Meitner Platz 1, 14109 Berlin, Germany
5. IEK5-Photovoltaik, Forschungszentrum Juelich GmbH, Wilhelm-Johnen-Straße, 52428 Juelich, Germany