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Dye sensitized solar cells (DSSC) are an attractive third-generation photovoltaic technology particularly promising for operation under diffuse and lower light conditions. However, high costs of the precious metals used for sensitizing dyes and low charge generation capability parameters limit the utility of DSSCs in comparison to conventional silicon solar cells. In this study, tin oxide (SnO₂) photoelectrodes are treated with non-thermal atmospheric pressure plasmas to enhance photovoltaic performance. The effects of nitrogen and argon plasma surface treatment of photoanodes on the efficiency enhancement of DSSCs are systematically investigated by fabricating solar cells using pristine SnO₂ and plasma-treated photoanodes. Solar cells made with Eosin Y sensitized pristine SnO₂ photoanode exhibited a short circuit current density (J_SC) of 1.03 mA cm⁻² and an overall power conversion efficiency (PCE) of 0.30 …