1. Laboratory for Photovoltaic Energy Conversion Department of Sustainable Systems Engineering (INATECH) University of Freiburg Emmy-Noether-Str. 2 79110 Freiburg Germany
2. Division Photovoltaics Department Quality Assurance, Characterization, and Simulation Fraunhofer Institute for Solar Energy Systems (ISE) Heidenhofstraße 2 79110 Freiburg Germany