Perparation And Study On Layer Built Electrode Of Dye-sensitized Solar Cells

The dye-sensitized solar cell（DSSC） is newly emerging solar cell. The TiO₂porous filmis the working electrode of a DSSC on which the dye molecules are adsorbed. When dyemolecules are excited by light, the TiO₂porous film transports the injected electrons from thedye. Meanwhile, the TiO₂porous film provides the place where the photoelectron-chemicalreactions occur. Therefore the performance of DSSC significantly depends on the quality ofTiO₂porous film. Photovoltaic performance of the single nano-porous TiO₂films isunsatisfactory, Suitable metal ion doping and semiconductor of different level nano-particlescomposite can improve the photoelectric properties of the electrode. In this paper, We havestudied the light anode of Dye-sensitized solar cell doped with spinel nanometer powders andthe effect of adding DMPII ionic liquid on the properties CuSCN-PEDOT/PSS electrolyte.CuCr₂O₄powders were prepared by coprecipitation process of alcohol-aqueous, andwere dispersed by surface active agent. We obtained the best preparation process ofpreparation of CuCr₂O₄powders. CuCr₂O₄particles were doped in titania powder withdifferent concentration and CuCr₂O₄/TiO₂composite films were prepared on FTO glasssubstrate by screen printing method. By using several testing means to measure and analysis,such as X-ray diffraction analysis（XRD）, Scanning Electron Microscope（SEM）, AbsorptionSpectra（UV-Vis）, Solar Simulator and Electrochemical Station. The work concerning theTiO₂film preparation and modification lays a solid foundation for further investigation ofDSSC.In DSSC, an electrolyte assumes the tasks of regenerating oxidized dye molecules and transportingelectrons. In this paper, in order to improve the stability and the photoelectric performances, nonvolatileand stable ionic liquid DMPII was added to the CuSCN-PEDOT/PSS composite solid electrolyte.The results indicate that:（1） when with the sintering temperature of1000oC and theamount of PEG-400of1.5wt%, the size of primary crystal grain was about48nm. TiO₂composite films doped with CuCr₂O₄nanoparticles, the CuCr₂O₄/TiO₂composite exhibithigh absorption ability in the spectral range600⁹00nm, and the absorptive amount in this region is increased by40%⁷0%. When the content of CuCr₂O₄was2%, composite filmelectrodes have preferable photoelectric properties, As compared with the pure TiO₂electrode,the parameters like Jsc and η are favorably increased by35%and44%.（2） When the amountof DMPII is2%，the performance of CuSCN-PEDOT/PSS is best. The stability of solidDSSC is much better. Under an illumination of100mW/cm², the Jsc, Voc, FF, η of solid DSSCare1.86mA/cm²,0.78V,0.62,2.64%respectively.