Preparation And Property Study Of Anode In Dye-sensitized Solar Cell

Dye-sensitized solar cell (DSSC) has become an arresting point of academy in the world due to its qualities such as continuability of development, friendliness to environment, simpleness of preparation and low cost. The efficiency of DSSC is affected by preparing methods and crafts seriously, hence optimizing the anode is an important part of the DSSC to intensify the photon absorbance and decrease charge recombination. The preparation, optimization and modification of the anode were studied in this paper. The preparation craft of titanium oxide which is the anode material of DSSC was studied through dip-coating method, hydrothermal method and the modification through doping nitrogen and metal ion such aluminum, nickel and zinc. At the same time the preparation craft of zinc oxide was studied. X-ray diffraction (XRD) and field emission scanning electronic microscopy (FESEM) were applied to characterize the phase structure and surface morphology. The photoelectric conversion and electrochemical properties of the cells were measured afterwards.The properties of DSSCs with the anode of titanium oxide are better than that of zinc oxide. The best cell of all in this paper was obtained when titanium oxide was prepared by hydrothermal method in 170 centigrade degree with no acetyl acetone or OP added, and after milling the slurry, the photoelectric conversion efficiency of the cell reached 6.37 percent. The best cell of all with zinc oxide as the anode material was obtained on condition that the ratio of mole between zinc acetate dihydrate and triethanolamine was sixteenth, whose photoelectric conversion efficiency reached 1.83 percent.It is concluded that a certain thickness compact titanium oxide film decorating the anode can enhance not only the short circle current but also the open circle voltage, a certain thickness of the anode film can intensify the voltage. The best cell is obtained by hydrothermal method in 170 centigrade degree. For the cells doped with nitrogen, the open circle voltage increases with the content of doping nitrogen The short circle current increases firstly and decreases finally with it and fill factor is enhanced. The efficiencies of the cells are not enhanced when doping aluminium, nickel and zinc ions in anatase. In the cells with zinc oxide by strong alkali method, sheets can enhance the current, the voltage increases with the decrease of ratio between salt and alkali, the current of cells with zinc oxide in basic route is larger than that in acid route. Higher fill factor is obtained by weak alkali and the voltage increases with the decrease of rate between salt and alkali. As the resistances of three-phase interface in DSSCs with zinc oxide as anode are much larger through impedance analysis, their efficiency is lower than those of the cells with titanium oxide as anode.