Current Photovoltaic Research ISSN:2288-3274(Print) 2508-125X(Online)

Cu2ZnSn(SxSe1-x)4 (CZTSSe) absorber thin films were prepared on Mo coated soda lime glass substrates by sulfoselenization of sputtered stacked Zn-Sn-Cu precursor thin films. The Zn-Sn-Cu precursor thin films were sulfo-selenized inside a graphite box containing S and Se powder using rapid thermal processing furnace at 540°C in Ar atmosphere with pre-treatment at 300°C. The effect of different S/Se ratio on the structural, compositional, morphological and electrical properties of the CZTSSe thin films were studied using XRD (X-ray diffraction), XRF (X-ray fluorescence analysis), FE-SEM (field-emission scanning electron microscopy), respectively. The XRD, FE-SEM, XRF results indicated that the properties of sulfo-selenized CZTSSe thin films were strongly related to the S/Se composition ratio. In particular, the CZTS thin film solar cells with S/(S+Se)=0.25 shows best conversion efficiency of 4.6% (V_oc : 348 mV, J_sc : 26.71 mA/cm² , FF : 50%, and active area : 0.31 cm² ). Further detailed analysis and discussion for effect of S/Se composition ratio on the properties CZTSSe thin films will be discussed.