1. Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education and Hunan Provincial Key Laboratory of Low‐Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha 410082 China
2. College of Materials Science and Engineering Hunan University Changsha 410082 China
3. Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education College of Chemistry Xiangtan University Xiangtan 411105 China
4. Shenzhen Research Institute of Hunan University Shenzhen 518063 China