1. Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstraße 2, 79110 Freiburg im Breisgau, Germany
2. Freiburg Materials Research Center (FMF) and Institute for Macromolecular Chemistry of the University of Freiburg, Stefan-Meier-Straße 31, 79104 Freiburg im Breisgau, Germany
3. Freiburg Center for Interactive Materials and Bioinspired Technologies (FIT), University of Freiburg, Georges-Köhler-Allee 105, 79110 Freiburg im Breisgau, Germany