Abstract
In this paper, we report thefabrication of a hetero-junction solar cell using nanocrystallinep-type Cu2ZnSnS4(CZTS) as absorber layer and ZnO as buffer layer.The effect of copper ratio on the properties of copper zinc tin sulfide nanoparticles synthesized using solvothermal method and the influence of Cu ratio on the cell efficiencies are also systematically investigated.The structural, optical andelectrical properties of prepared nanoparticles were studied using X-ray powder diffraction, Raman analysis, scanning electron microscopy, UV-vis absorption and J-Vcharacteristic studies.The device fabrication and conversionefficiency of cadmium free CZTS/ZnOsolar cellsare also discussed.The highestpower conversion efficiency of the solar cell was observed to be 3.2% for copper slightly poor (0.9) compositional ratio.
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