1. CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, People's Republic of China
2. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
3. School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
4. Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning, Guangxi 530004, People's Republic of China
5. Beijing Institute of Tracking and Telecommunications Technology, Beijing 100094, People's Republic of China