The compositionally graded dye-titania electrode (WE-C) was prepared by combining thin films having different compositions of dye and titania through a sol-gel process. The photoelectric conversion efficiency of WE-C was higher than the normal electrode (WE-N) because a step-like band structure was formed due to the difference in the conduction band level of the thin layers in the WE-C. This structure is presumed to provide the driving force of the electron transport and inhibit the back electron transfer.