1. School of Micro-Nano Electronics, Hangzhou Global Scientific and Technological Innovation Center (HIC), Zhejiang University, Xiaoshan 311200, China
2. State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
3. ZJU-UIUC Joint Institute, Zhejiang University, Jiaxing 314400, China
4. School of Physics and Electronics, Hunan University, Hunan 410082, China
5. Department of Chemistry and Biochemistry, University of California, Los Angeles (UCLA), Los Angeles, California 90095-1569, United States