1. Lehrstuhl für Anorganische Chemie I, Universität Bayreuth, Universitätsstr. 30, D-95440 Bayreuth, Germany, Research and Development, Covion Organic Semiconducturs GmbH, D-65926 Frankfurt, Germany, Institute of Physics, Department of Condensed Matter Physics, University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany, Institute of Molecular and Atomic Physics, National Academy of Sciences, 220072 Minsk, Belarus, and Institut für Physikalische Chemie, Universität Regensburg, D-93040 Regensburg,...