[1] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany
[2] Weizmann Inst Sci, Dept Mat & Interfaces, IL-76100 Rehovot, Israel
[3] Forschungszentrum Julich, Photovolta IEK5, D-52425 Julich, Germany
[4] Univ Duisburg Essen, Fac Engn, D-47057 Duisburg, Germany
[5] Univ Duisburg Essen, CENIDE, D-47057 Duisburg, Germany
[6] InnovationLab, D-69115 Heidelberg, Germany
[7] TU Braunschweig, Inst High Frequency Technol, D-38106 Braunschweig, Germany
[8] Univ Penn, Dept Chem, Philadelphia, PA 19104 USA
[9] Columbia Univ, Dept Chem, New York, NY 10027 USA