In this article, we report the improvement of energy conversion efficiency by a simple process for dye-sensitized solar cells (DSSCs). Some previous studies were reported in which TiO2 nanowires were used in the place of TiO2 nanoparticles as a TiO2 electrode because nanowires possess a good electron transport property. However, if larger sizes of nanowires are used for the TiO2 electrode, a large void between nanowires and a decrease in surface area are observed. To solve this problem, we report a TiO2 nanoparticle/nanowire hybrid electrode for DSSCs, which showed both a good electron transport property and dye adsorption. TiO2 nanofibers were fabricated by an electrospinning method and sol-gel techniques. TiO2 nanowires, whose diameters were controlled by varying the polymer concentration in the electrospinning solution, were successfully applied to DSSCs. We examine how TiO2 nanowires can work in the TiO2 electrode. In this study, we demonstrated that this hybrid electrode has an advantage in the efficiency of DSSCs. (C) 2012 The Japan Society of Applied Physics