Modelling of Trap Assisted Diffusion in Mesoporous Films for Dye-sensitized Solar Cells

The Analytical expressions describing electron transport in dye sensitized solar cells are studied. An exponential distribution of trap states can account for observed power law dependence of the electron transport rate on the electron population. By means of coupling of diffusion model with multiple trapping model, a detailed analysis of TiO₂ dyesensitized solar cells has been performed. Both concentrations of electrons in conduction band and in traps have non monotonic behavior at low porosity values but with high porosity both of these values first rise and then fall. However, thicker electrodes have higher population in both conduction band and trap states.