An Exploratory Study on TiO2 Film Thickness Related Photocurrent Decreasing in Dye-sensitized Solar Cells

TL;DRAbstract

This paper studies the effects of titanium dioxide films with different thickness on the photocurrent. The results show that titanium dioxide itself is not able to reduce Isc as long as the film thickness is less than 50m-100m (the electron diffusion length).The real factors affecting the photocurrent is the number of photoelectrons which could be injected into the TiO 2 conduction band generated by dye adsorped on the surface of TiO 2 . The thickness of the film provides a huge space for the dye molecules, but dye molecules quenching might play an important role to prevent the photoelectrons from injecting into the conducting band of TiO 2 . The improvement mechanism of Isc was discussed and an intriguing approach to enhance Isc was addressed.

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