The effects of the acidic treatment on the photovoltaic properties of the dye-sensitized solar cell (DSSC) were investigated. TiO₂ nanostructure was prepared by chemical bath deposition method and the surface was modified by various acidic treatments like hydrochloric acid (HCl), nitric acid (HNO₃), sulphuric acid (H₂SO₄), and acetic acid (CH₃COOH). The results exhibited a significant influence of acidic treatments on structural, morphological, optical, electrochemical, and photovoltaic properties. XRD analysis confirms the formation TiO₂ nanostructure electrodes. After acidic surface treatment photoconversion efficiency increases from 1.97% (for pristine electrode) to 3.23% (for acetic acid surface treatment). With respect to that electron lifetime increased from 0.34 to 0.54 ms and charge transfer resistance decreased from 25.76 Ω cm (pristine TiO₂ electrode) to 17.96 Ω cm.