Study On The Dye-sensitized Solar Cells

In this paper,brief introduction of dye-sensitized solar cell(DSC)'s theory,structure,status and development trend were outlined.On the basis of prepared DSC devices using pure organic dye D102,the paper focused on different methods of prepare TiO₂ film and ultraviolet treatment which impact on the DSCs' photoelectric properties.The impacts of ultraviolet treatment on the D102-level and the dye level on DSC were also research.Using TiO₂ film as anode,its photo-electron properties impact the DSC's photoelectric conversion efficiency directly.Single layer and double layer of TiO₂ films were prepared by different methods such as sol-gel,powder coating and magnetic sputtering.The surface morphologies and crystal structures of the films were characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD). With the differences of film structure and photo-electron properties,analysis between single and double layer device showed that:the properties of the cell composed of double layer(by dense layer and porous layer)were better than that composed of single layer film.In addition to study the various impacts of materials,technology and process,deal semiconductor anode with certain methods will also have a major impact on the photoelectric properties of DSC.In order to further improve the performance of photoelectric cells,ultraviolet irradiation treatment was organized before the device assembled.These cells show the characteristics that J_SC=8.65mA/cm²,η=3.47%,when no further optimization was done.After UV-mediated 10min,the short current density goes up to 11.31mA/cm²,which leads to the efficiency of 3.99%.The highest occupied molecular orbital(HOMO)and lowest unoccupied molecular orbital(LUMO)levels of the dye,the optical absorption and photocurrent spectra of the solar cells were also measured in order to explain the large enhance of short current.We also discussed that there may be other factors which impact on the photoelectric characteristics of DSC after the ultraviolet irradiation treatment.