Synthesis And The Photoelectric Property, Energy Storage Performance Of The Composites Photoanodes For Dye-sensitized Solar Cells

Dye-sensitized solar cells (DSCs) have attracted more attention due to low-cost and highefficiency. As we all know, photoanodes have been considered as one of the main factors forDSCs. In this paper, with the aim of assembling DSCs which have practical values byfabricating series of composite photoanodes, a great deal of effort were done to make sure itshigh absorbtion of dye, suppress the charge recombination and enhance the open-circuitpotential or store solar energy. The main work are follows:Study based on ZnO@TiO2composite photoanodes of DSCs. The ZnO@TiO2hybirdphotoanode which consists of a ZnO coating layer and a ZnO nanoflowers scattering layerwere prepared by a simply solution method. The hybrid photoanodes were then characterizedby X-ray diffraction scanning (XRD)、 scanning electron microscopy (SEM) andcurrent-voltage mearsurements(I-V). The results show that ZnO@TiO2composite whichgrows60min can efficiently suppress electron recombination by forming an energy barrierlayer and can led to the higher light harvesting efficiency by forming the ZnO nanoflowers,and enhance the open-circuit potential to0.90V. We also discussed interplay betweendifferent sensitized time and the photoelectric properties, which suggests that the DSC withsensitized time of2h can effectively reduce the Zn2+/dye complexes and get the betterperformance(Voc of0.90V and Jsc of3.86mA/cm2). Meanwhile, we coat another TiO2layeras protection for ZnO@TiO2photoanodes and get the best performance (Voc of0.82V andJsc of8.92mA/cm2).Study based on MnO2/TiO2composite photoanodes of DSCs. The hybrid photoanodeswhich were prepared by manganese acetate and were characterized by SEM、XRD、I-V. Itshows that the photoelectric conversion efficiency of composite photoanode is increased by17.9%, when the doping concentration of manganese acetate was0.08M. The analysis byEIS shows that this structure can suppress electron recombination and enhance the electronlifetime.Study of the DSCs with solar-energy conversion and electric energy storage in situ. Thecomposite photoanodes were fabricated by forming the mixture which consists of moltenmanganese acetate and TiO2. The results show that the composite photoanodes havecapacitance characteristics. From the study of the doping concentration of manganese acetate,we find that the DSCs with composite photoanode shows area specific capacitance is1.41mF/cm2and the photoelectric conversion efficiency can get3.55%.