Proposal of photoelectric conversion device structures fabricated by merging molecular diffusion engineering in continuous nanopores and photoelectron conversion interface engineering

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Our objective is to propose items which are necessary to increase efficiency of dye-sensitized solar cells from the view point of diffusion of redox species in TiO2 nanopores whose wall is stained by dye molecules. When wall of nano pores was stained by dyes having similar size of substituents, diffusion of redox species in nanopores stained with dyes bearing polar substituents became low and open circuit voltage was low. This was explained by facile charge recombination between slowly diffused redox speciesand TiO2 electrons in nanopores. Dyes with hydrophobic long alkyl groups are proposed to be preferable for dye-sensitized solar cells with high open circuit voltage from the view point of redox diffusion in nanopores stained by dyes.