The Effect of the Thickness of Nanoporous TiO2 Film on the Performance of Nanocrystalline Dye-Sensitized Solar Cell

Dye-sensitized solar cell (DSSc) consists of a TiO2 nanostructured film of the photo-electrode, dye molecules on the surface of the TiO2 film, an electrolyte layer and a counter electrode. Among these, the nanoporous TiO2 film plays an important role as the photo electrode in DSC because it adsorbs a large number of the dye molecules which provide electrons. Therefore, the condition of the TiO2 film affects the cell performance such as current density (Jsc), open circuit voltage (Voc) and fill factor (FF). The thickness of TiO2 film is one of these conditions. Its variation influences on the internal impedances of DSC related to the electron transport. As a result, it was observed that the variation of the TiO2 thickness has an effect on the electron transport in the DSC. The results showed higher efficiency of DSSC for home-made TiO2 (H-TiO2) cells with same dependence of cell efficiency on the film thickness for both H-TiO2 and P25 cells. The best efficiency obtained in this work is 1.82% from H-TiO2 cell with TiO2 film thickness of 13μm. The correlation between the TiO2 films thickness and photoelectron chemical properties of DSSCs fabricated from P25 and H-TiO2 was compared and discussed

کلیدواژه ها:

nanoporous titania ، electrochemical impedance ، N719 ، Dye-sensitized solar cells