[1] Chinese Acad Sci, Inst Solid State Phys, Hefei Inst Phys Sci, Hefei, Peoples R China
[2] Univ Sci & Technol China, Hefei, Peoples R China
[3] Chinese Acad Sci, Key Lab Photovolta & Energy Conservat Mat, Hefei, Peoples R China
[4] Anhui Inst Innovat Ind Technol, Luan Branch, Luan, Peoples R China