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

我们的目标是从氧化还原物种在壁被染料分子染色的二氧化钛纳米孔中的扩散的角度，提出提高染料敏化太阳能电池效率所必需的条件。当具有相似取代基大小的染料染色纳米孔壁时，含有极性取代基的染料染色的纳米孔中氧化还原物种的扩散变小，开路电压较低。这可以通过缓慢扩散的氧化还原物种和纳米孔中的二氧化钛电子之间的简单电荷复合来解释。从染料在纳米孔中氧化还原扩散的角度来看，具有疏水长烷基团的染料更适合于高开路电压的染料敏化太阳能电池。

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.