1. State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China
2. Max Planck Institute for Polymer Research Ackermannweg 10 D‐55128 Mainz Germany
3. Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate University Okinawa 904‐0495 Japan
4. Department of Chemistry University of Cologne Greinstr. 4‐6 D‐50939 Cologne Germany