1. State Key Laboratory of Electronic Thin Film and Integrated Devices; University of Electronic Science and Technology of China; Chengdu 610054 China
2. Soochow Institute for Energy and Materials InnovationS; College of Physics; Optoelectronics and Energy and Collaborative Innovation Center of Suzhou Nano Science and Technology; Soochow University; Suzhou 215006 China
3. Department of Applied Physics; Nanjing University of Science and Technology; Nanjing 210094 China
4. Testing and Analysis Center; Soochow University; Suzhou 215123 China