Polymer electrolyte membranes based on poly(ethylene oxide) (PEO) doped with TiO2 nanoparticles were synthesized by simple solution cast technique. Mesoporous TiO2 film was prepared by doctor-blade method. The modified polymer membranes and the mesoporous films were characterized by SEM, TEM, AFM, ionic conductivity, and J-V measurements. Dye-sensitized solar cells (DSSC) have been fabricated in which PEO-polymer electrolyte doped with and without nano-TiO2 were sandwiched between porous TiO2 and counter electrodes. The DSSC with nano-TiO2 doped polymer electrolyte shows better performance (1.68%) in comparison with pristine polymer electrolyte (1.07%), which is due to improved ionic conductivity value in polymer electrolyte system by nano-TiO2 doping. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 118: 2976-2980, 2010