Effect of TiO2 photoelectrode thickness on the performance of dye-sensitized solar cells

TiO2 photoelectrodes for dye-sensitized solar cells (DSSCs) were fabricated by changing the thickness using screen printingmethod. The amount of dye adsorbed on TiO2 increases as the thickness of the TiO2 photoelectrode increases because of theincrease in the dye molecule adsorption site. The performance of DSSCs increases up to a TiO2 thickness of approximately12 ㎛, indicating a tendency of dye adsorption that enables photocurrent generation. However, when TiO2 is thicker than 12㎛, the TiO2 films start to break, resulting in a decrease in the performance. The optimum thickness of the TiO2photoelectrode was 12 ㎛, which has a low charge transfer resistance.