Simulation on the carrier transport process inside the semiconductor of dye sensitized solar cells by wxAMPS software

wxAMPS, a custom-designed software package for solar cell simulation, is used to simulate the performance of dye sensitized solar cells (DSCs). A carrier transport process inside the semiconductor is illustrated based on the assistance of wxAMPS. It is assumed that a bent band with a build-in electrical field exists at the semiconductor-dye interface when the semiconductor particle size is large enough, while the flat-band potential exists when the semiconductor is nanocrystalline. Effects of the build-in electrical field on the performance of the unit cells are described on the basis of the simulation results. It is shown that the enhanced carrier transport and the low recombination velocity caused by the build-in electrical field lead to a better photovoltaic performance of the unit cells.