Study On Composite Film Electrodes Of Dye-sensitized Solar Cells

The solar energy is a inexhaustible green energy. It is one of the optimal way to resolveenergy crisis. Dye-Sensitized Solar Cell (DSSC) is a new type of the solar cell. Because of itssimple fabrication procidure, low cost, better stability and clean energy, DSSC has arouseworld researches and application prospect. At present, the total efficiences of DSSC based onnanoporous TiO2electrodes has been over11%. However, a single nano-porous thin filmphotoelectric conversion performance of DSSC was not very satisfactory. Because of varioussurface states on the TiO2thin film results in the recombination between thephoto-generatedelectrons and the holes, increases the dark current, and reduces the total efficiency of theDSSC. And appropriate doping can enhance its optical properties. The study found that themulti-component oxides can be more free to change their regulation of the physical andchemical properties, so that multi-oxide energy band, working methods, electrical resistivityis very easy to adjust. NiAl2O4is a narrow gap semiconductor with good visible lightabsorption properties, catalytic, acid and alkali, etc. Thus, in this paper, spinel compositeoxide NiAl2O4was doped to modified TiO2anode. As the two kinds of semiconductorconduction band, valance band, band gap occur overlap inconsistent, to extend the spectralresponse of TiO2to improve the absorbance of thin film electrodes.In this arctile, NiAl2O4nano-powders was prepared by coprecipitation process ofalcohol-aqueous, They were doped in TiO2powder and NiAl2O4/TiO2composite filmelectrodes were prepared on FTO glass substrate by screen printing method. The effects ofprocessing parameters on properties of composite film electrodes were studied, the surfacemorphology, absorption and the photoelectric effect of the film was discussed. Ultimately, theanalysis determined the best doped ratio of nano-powder.The experimental results show that doping NiAl2O4nano-powders can improved the theconversion of photoelectric efficiency of the solar cells, when the content of NiAl2O4was2%,composite film electrodes had preferable photoelectric properties. Compared with pure TiO2film electrode, η increased17.4％and reached to5.93%. When the content of NiAl2O4was3%, η increased5.26%. Compared with the content of NiAl2O4was2%, the conversion efficiency was decreased. So to get a higher performance, it was necessary to strictly controltle content of NiAl2O4.