1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, P. R. China
2. School of Microelectronics, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, P. R. China
3. School of Materials Science and Engineering, Computational Centre for Molecular Science, Institute of New Energy Material Chemistry, Nankai University, Tianjin 300350, P. R. China
4. Faculty of Science, Kunming University of Science and Technology, Kunming 650093, Yunnan, P. R. China