The temperature dependence in the surface treatment of TiO(2)photoelectrode on the photovoltaic properties of dye-sensitized solar cells (DSSCs) was studied. A nanoporous TiO(2)electrode was modified with aqueous NaOH solution by simple dip coating process at varied temperatures and dipping time, and then applied to DSSCs. Throughout the optimization of surface-treatment temperature (40 degrees C) and time (10min), we obtained a higher power conversion efficiency (PCE) of 7.7% in DSSC with NaOH-modified TiO(2)layer, compared to that (6.81%) of reference device with bare TiO2. The enhancement in PCE was attributed to an increase in open circuit voltage due to a negative shift of conduction band edge, arising from the anion formation on TiO(2)surface.