Thickness effect of nanocrystal TiO2 photoanodes on Dye Sensitized Solar Cells (DSSC) performances

In this paper, the thickness effect of TiO₂ photoanodes on Dye Sensitized Solar Cells (DSSCs) is investigated. The optimization thickness of 12~15μm nanocrystal TiO₂ is experimentally demonstrated and reproduced by simulation for the large-size DSSCs (4cm-4cm). The simulation shows that thinner TiO₂ electrodes lead to smaller current due to the shortage of the absorbed dye molecular but thicker TiO₂ electrodes also cause the same effect due to the enhanced dark reaction between electrons in the TiO₂ and the electrolytes and the loss of the electrons during transportation in TiO₂ electrodes.