By increasing the pore and particle size of porous TiO 2 films, the photovoltaic properties of solid-state dye-sensitized solar cells were dramatically improved. We analyzed the relation between the photovoltaic property and the microstructure of TiO 2 /Dye/CuI measured by scanning electron microscopy of the cross section of the cells. The larger pore size of the TiO 2 films improved the CuI filling and the high degree of filling improved the short-circuit current density. Multilayered TiO 2 films consisting of a TiO 2 layer with small TiO 2 particles and a second layer with larger TiO 2 particles gave a power conversion efficiency under 1 sun of 6.0%. #
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