[1] Nanjing Univ, Natl Lab Solid State Microstruct, Ecomat & Renewable Energy Res Ctr ERERC, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China
[4] Qingdao Agr Univ, Coll Chem & Pharmaceut Sci, Qingdao 266109, Peoples R China