Study On Dye-sensitized Solar Cell Based On The Structure Of Titania/Dye/Polyaniline

With the global economic development and the drying up mineral resources, the development of solar energy resources are received more and more attention, utilizing dye sensitized solar cells(DSSC) is an effective way for using solarenergy. DSSC have a large advantage in low price,simple production process and the potential for high conversion efficiency. It is easy for industrial production in large amount, while all the raw materials and production processes are non-toxic,non-polluting. the safety for the human and environment is apparent which makes it possible to replace the traditional silicon solar cells and to become the leading solar cell.Based on the current development of dyesensitized solar cells both inside and outside China, this paper has mainly carried on the following aspects of work: TiO2 thin films and M-TiO2 (M=K,Na,Mg,Ca,Co,Sn,Fe,Ni) thin films doped by different metal ions were prepared by sol-gel method. The structure, morphology and properties of TiO2 thin films were investigated by XRD,AFM and UV-Vis spectroscopy. The results showed that doping 2%(mol%) metal ions did not change the lattice structure of TiO2, but their absorption peaks can significantly produce red shift in visible light region and the energy band gap decrease,The energy band gap of Mg-TiO2 and Ni-TiO2 are the same of 2.09ev. so that M-TiO2 thin films were better than TiO2 thin films for dye-sensitized solar cells anode.The natural dyes used as sensitizer were extractioned from the Basil leaves and cauliflower. Its absorption spectrum and the effect of sensitization were analyzed, absorption peak of natural dyes appears in the visible 670nm and it has good sensitized effect on the doping of 2% and 2.5% molMg ions of TiO2 electrode.The eigenstates of the polyaniline was prepared by micro emulsion method and doped with protonic acid. the absorption peak of polyaniline appears at the 400nm, and the absorption peak of doping polyaniline decreased at 400nm or maybe even disappeared, but a broad absorption peak appears between750nm and 800nm. The surface fo Polyaniline film is flat and uniform with little roughness. The quality of the film is good. the doped polyaniline conductivity is 2.58S·cm-1 which was measured by four-probe method. The ohmic contact performance and rectifying properties of the solar cell devices were tested,the results showed that the device has a good ohmic contact and a good rectifying behavior. We studied the photoelectricity effects of device with different circumstance,such as with several solar cell cathodes which were made from different materials and different TiO2 anodes which were doped with different consistency of Mg ion. We found out that the electrode which was made from ITO has more advantages than that was made from Al,the ITO/1.5Mg-TiO2/Dye/PANI/ITO solar cell devices with 1.5% mol Mg ion doped get better battery performance,such as open circuit voltage and short circuit current reaches 247mV and 0.3 mA.