Developments of High-Efficiency Flexible Cu(In,Ga)Se2 Thin Film Solar Cells on a Polyimide Sheet by Sodium Incorporation
ZHANG Li1**, LIU Fang-Fang1, LI Feng-Yan1, HE Qing1, LI Chang-Jian1, LI Bao-Zhang1, ZHU Hong-Bing2
1Tianjin Key Laboratory for Photoelectronic Thin Film Devices and Technology, Nankai University, Tianjin 300071 2College of Physics Science and Technology, Hebei University, Baoding 071002
Abstract：We present the fabrication of flexible Cu(In,Ga)Se2 (CIGS) solar cells on a polyimide (PI) sheet with and without Na incorporation. A sodium element is incorporated into the CIGS absorber by using a NaF precursor after Mo back contact deposition. X-ray diffraction patterns show that the (112) preferred orientation of the as-grown CIGS films is decreased by Na incorporation. The secondary phase of (Inx,Ga1?x)2Se3 is observed for the CIGS films with Na. There is no significant difference in the grain size with and without Na incorporation from surface and cross-sectional SEM images. Additionally, the increase of carrier concentration and decrease of resistivity of CIGS absorber are induced by Na doping. Finally, the flexible CIGS solar cells on PI sheets with efficiency close to 11%, containing Na, are achieved. The improvement of cell efficiency can be attributed to the modified electrical properties of the CIGS film by Na incorporation.
. [J]. 中国物理快报, 2014, 31(06): 68402-068402.
ZHANG Li, LIU Fang-Fang, LI Feng-Yan, HE Qing, LI Chang-Jian, LI Bao-Zhang, ZHU Hong-Bing. Developments of High-Efficiency Flexible Cu(In,Ga)Se2 Thin Film Solar Cells on a Polyimide Sheet by Sodium Incorporation. Chin. Phys. Lett., 2014, 31(06): 68402-068402.
2014, Vol. 31 
