1. The Department of Electronic and Information EngineeringThe Hong Kong Polytechnic University Hong Kong 999077 China
2. Department of PhysicsThe Chinese University of Hong Kong Hong Kong 999077 China
3. MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationState Key Laboratory of Silicon MaterialsDepartment of Polymer Science and EngineeringZhejiang University Hangzhou 310027 China
4. Centre of Super‐Diamond and Advanced Films (COS DAF)Department of ChemistryCity University of Hong Kong Hong Kong 999077 China
5. State Key Laboratory of Polymer Physics and ChemistryBeijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of Sciences Beijing 100190 China