AgSbS2 is a promising absorber material for photovoltaic cells because of its optimum bandgap, strong optical absorption, and excellent stability. Here, we report a spin-coating and annealing approach for the fabrication of AgSbS2 solar cells, where Ag-Sb-thiourea complex solution was prepared as the precursor solution. We identified that the annealing temperature crucially affected the phase composition, crystallinity, and surface morphology of the AgSbS2 film. We also probed the electronic structures and established a FTO/TiO2/AgSbS2/Spiro-OMeTAD/Au device structure. This device finally achieved an encouraging power conversion efficiency of 2.25%, which is highest efficiency in AgSbS2 solar cells. Our research opens up another prospect for pursuing high performance AgSbS2 thin film solar cells by adopting a solution processing method and planar heterojunction device structure.
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