Improvement of the Open Circuit Voltage of CZTSe Thin-Film Solar Cells by Surface Sulfurization Using SnS

【摘要】 The objective of this study is to find an effective method to improve V_OC without J_SC Joss for Cu₂ZnSnSe₄（CZTSe） thin film solar cells,which have been fabricated by the one step co-evaporation technique.Surface sulfurization of CZTSe thin Elms is carried out by using one technique that does not utilize toxic H₂S gas;a sequential evaporation of SnS after CZTSe deposition and the annealing of CZTSe thin films in selenium vapor.A Cu₂ZnSn（S,Se）₄（CZTSSe） thin layer is grown on the surface of the CZTSe thin film after the annealing.The conversion efficiency of the completed device is improved due to the enhancement of V_OC,which could be attributed to the formation of a hole-recombination barrier at the surface or the passivation of the surface and grain boundary by S incorporation.更多还原

【Abstract】 The objective of this study is to find an effective method to improve V_OC without J_SC Joss for Cu₂ZnSnSe₄（CZTSe） thin film solar cells,which have been fabricated by the one step co-evaporation technique.Surface sulfurization of CZTSe thin Elms is carried out by using one technique that does not utilize toxic H₂S gas;a sequential evaporation of SnS after CZTSe deposition and the annealing of CZTSe thin films in selenium vapor.A Cu₂ZnSn（S,Se）₄（CZTSSe） thin layer is grown on the surface of the CZTSe thin film after the annealing.The conversion efficiency of the completed device is improved due to the enhancement of V_OC,which could be attributed to the formation of a hole-recombination barrier at the surface or the passivation of the surface and grain boundary by S incorporation.更多还原