[1] Guangzhou Univ, Sch Phys & Mat Sci, Guangzhou 510006, Peoples R China
[2] Guangzhou Univ, Sino Singapore Guangzhou Knowledge City, Res Ctr Adv Informat Mat CAIM, Huangpu Res & Grad Sch, Guangzhou 510555, Peoples R China
[3] Dept Educ Guangdong Prov, Key Lab Si Based Informat Mat & Devices & Integrat, Guangzhou, Peoples R China