1. School of Physical Science and Technology Soochow University Suzhou Jiangsu China
2. Nanospectroscopy Group and Center for NanoScience Nano‐Institute Munich Faculty of Physics Ludwig‐Maximilians‐Universität München 80539 Munich Germany
3. Organic Semiconductors Group Institute of Physics University of Augsburg 86159 Augsburg Germany
4. Soft Condensed Matter Group and Center for NanoScience Faculty of Physics Ludwig‐Maximilians‐Universität München 80539 Munich Germany
5. Chair of Applied Physics and Center for NanoScience Ludwig‐Maximilians‐Universität München Amalienstr. 54 80799 Munich Germany