1. National Key Laboratory of Science and Technology on Micro/Nano Fabrication Key Laboratory for Thin Film and Microfabrication of Ministry of Education Department of Micro/Nano‐electronics Shanghai Jiao Tong University Shanghai 200240 P. R. China
2. Key Laboratory of Functional Molecular Solids of Ministry of Education Anhui Laboratory of Molecule‐Based Materials College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241000 P. R. China
3. National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 P. R. China