1. State Key Laboratory of Silicon Materials; Key Laboratory of Novel Materials for Information Technology of Zhejiang Province and School of Materials Science and Engineering; Zhejiang University; Hangzhou, Zhejiang 310027 P.R. China
2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter; Chinese Academy of Science; Fuzhou, Fujian 350002 P.R. China
3. Department of Information; Zhejiang University City College; Hangzhou, Zhejiang 310015 P.R. China