1. Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States
2. Department of Electrical and Computer Engineering - Electrophysics, University of Southern California, Los Angeles, California 90089, United States
3. Department of Chemistry, University of Southern California, Los Angeles, California, CA 90089, United States
4. Institute of Solid State Physics, Friedrich Schiller University Jena, 07743 Jena, Germany
5. Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, 07743 Jena, Germany
6. Institute of Materials Science and Engineering, Technische Universität Chemnitz, 09125 Chemnitz, Germany
7. Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, United States