1. Eco-materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences Nanjing University No. 22 Hankou Road Nanjing, Jiangsu 210093 P. R. China
2. Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures, Department of Physics Nanjing University No. 22 Hankou Road Nanjing, Jiangsu 210093 P. R. China
3. Collaborative Innovation Center of Advanced Microstructures Nanjing University No. 22 Hankou Road Nanjing, Jiangsu 210093 P. R. China
4. Kunshan Innovation Institute of Nanjing University 1699 Zuchongzhi South Road Kunshan, Jiangsu 215347 P. R. China
5. Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics Wuhan, Hubei 430074 P. R. China
6. Shenzhen Municipal Design & Research Institute Co., Ltd. Shenzhen, Guangdong 518029 P. R. China
7. Macau Institute of Systems Engineering Macau University of Science and Technology Macau 999078 P. R. China
8. School of Science and Engineering The Chinese University of Hong Kong, Shenzhen 2001 Longxiang Blvd. Longgang District, Shenzhen 518172 P. R. China