[Zhou, Ni; Li, Jia; Cao, Yong; Sha, Xin; Gao, Yuanhong; Bai, Xianwei; Yu, Xue-Feng; Meng, Lingqiang] Chinese Acad Sci, Shenzhen Inst Adv Technol, Mat Interfaces Ctr, Shenzhen 518055, Peoples R China.
[Cao, Yong] Hengyang Normal Univ, Sch Phys & Elect Sci, Hengyang 421002, Peoples R China.
[Sha, Xin] Univ Sci & Technol China, Nanosci & Technol Inst, Suzhou 215123, Peoples R China.
[Shao, Yan] Chinese Acad Sci, Shenzhen Inst Adv Technol, Ctr Informat Photon & Energy Mat, Shenzhen 518055, Peoples R China.
[Wei, Yu-Ming; Liu, Jin] Sun Yat Sen Univ, Sch Phys, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China.