1. Electrochromic Center, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, P. R. China
2. Solid State Electronics, Ågströmlaboratoriet, Uppsala University, Uppsala 75121, Sweden
3. School of Energy and Power Engineering, Beihang University, Beijing 100191, P. R. China
4. The College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China
5. Jiangsu Fanhua Glass Company, Limited, Hai’an, Nantong, Jiangsu Province 226611, P. R. China