1. Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg, Germany
2. Institute for Renewable Energy Technologies (in.RET), University of Applied Sciences Nordhausen, Weinberghof 4, 99734 Nordhausen, Germany
3. Institute of Semiconductors and Microsystems, Technische Universität Dresden, 01062 Dresden, Germany