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;
China;
School of Nanoscience and Technology;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
College of Physics and Optoelectronic Engineering;
Shenzhen University;
Shenzhen 518060;
China;
