1. Materials, Chemical, and Computational Science National Renewable Energy Laboratory Golden CO 80401 USA
2. Metallurgical and Materials Engineering Colorado School of Mines Golden CO 80401 USA
3. The Ohio State University Columbus OH 43210 USA
4. Zentrum für Sonnenenergie-und Wasserstoff-Forschung 70563 Stuttgart Germany
5. Nantes Université CNRS Institut des Matériaux de Nantes Jean Rouxel IMN F-44000 Nantes France
6. Institute of Energy Conversion University of Delaware Newark DE 19716 USA