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The layer boundary effect on multi-layer mesoporous TiO2 film based dye sensitized solar cells

机译：多层中孔TiO2膜染料敏化太阳能电池层边界效应

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Multi-layer mesoporous TiO _(2) prepared by screen printing is widely used for fabrication of high-efficiency dye-sensitized solar cells (DSSCs). We compare the three types of ～10 μm thick mesoporous TiO _(2) films, which were screen printed as 1-, 2- and 4-layers using the same TiO _(2) nanocrystal paste. The layer boundary of the multi-layer mesoporous TiO _(2) films was observed in the cross-section SEM. The existence of a layer boundary could reduce the photoelectron diffusion length with the increase of layer number. However, the photoelectron diffusion lengths of the Z907 dye sensitized solar cells based on these different layered mesoporous TiO _(2) films are all longer than the film thickness. Consequently, the photovoltaic performance seems to have little dependence on the layer number of the multi-layer TiO _(2) based DSSCs.
机译：通过丝网印刷制备的多层介孔TiO _（2）广泛用于制造高效染料敏化太阳能电池（DSSCs）。我们比较三种类型的〜10μm厚的介孔TiO _（2）薄膜，其使用相同的TiO _（2）纳米晶浆料印刷为1-，2-和4层。在横截面SEM中观察到多层中孔TiO _（2）膜的层边界。层边界的存在可以随着层数的增加而降低光电子扩散长度。然而，基于这些不同的层状介孔TiO _（2）膜的Z907染料敏化太阳能电池的光电子扩散长度均长于膜厚度。因此，光伏性能似乎几乎没有基于基于多层TiO_（2）的DSSC的层数。

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