The Study On The Preparation And Performance Of Photoanode Of Dye-sensitized Solar Cell

Currently,Dye-sensitized solar cell is still in continuous improvement and perfection.We can improve its photoelectric conversion performance by modifying anode and cell's structure.In order to improve the photovoltaic performance of cells,people developed a variety of physical and chemical modification technology to improve the characteristics of nano-TiO2 electrodes.These techniques include surface modification of the porous electrode film,the doped of nano-TiO2 and surface modification of the conductive glass.Particularly in terms of the charge transport between the interface.If the reverse current can be reduced between the interface.It has a big significance to improve the conversion efficiency of the cell in reduces the recombination chance of positive and negative charge.Firstly,the paper use hydrothermal method to prepare nano-TiO2,then use it to prepare TiO2 anode.We also doped Zn2+ to nano-TiO2 to improve its performance.Experimental results show that hydrothermal synthesis of TiO2 at 180? and reaction 12h produced the highest photoelectric conversion efficiency,it was 4.00%.Secondly,the main purpose of this paper is to improve the contact between each FTO conductive glass with the electrolyte,so as to suppress the occurrence of the reverse reaction.The main method is to deposit a dense layer on the surface of FTO by magnetron sputtering,comprising a dense Ti layer and a dense layer of TiO2.After the deposition of Ti dense layer,we annealed oxide it to get TiO2 film.By changing the sputtering power,sputtering time,annealing temperature,annealing time these four factors to study its impact on the cell's photoelectric performance and absorption properties of the dye.And analyze the optimal condition to improve the photoelectric conversion efficiency of the cell.Studies have shown that the photoelectric conversion efficiency of a solar cell assembled into a maximum of 5.12%when the sputtering power is 150W,the sputtering time is 1h,the annealing temperature is 450?,the annealing time is 1h.From the XRD pattern of the Ti film,we found that the crystallization peak of Ti does not appear.This shows that the Ti film prepared by magnetron sputtering,in the case without any treatment,its composition does not have TiO2,only the metal Ti,and is amorphous.Ti film after annealing treatment at the temperature of350??400??450?,its XRD patterns have emerged in four diffraction peaks.The intensity of diffraction peak increases as the annealing temperature increased.This shows that as the annealing temperature increases,the film is more fully crystallized,anatase gradually increased,also tend crystalline perfection,and there is preferential growth trend.We main study the deposition thickness impact on the Dye-sensitized solar cell photovoltaic properties when deposited TiO2 dense layer.Without the presence of the dense layer,photocurrent density Jsc is 7.56Ma/cm2,an open circuit voltage is 0.78V,the photoelectric conversion efficiency is 2.31%.Assembled into a cell when the thickness of the TiO2 dense layer is 80nm,the maximum photoelectric conversion efficiency as 6.72%.As can be seen,with the increase in the thickness of the dense layer,the photoelectric conversion performance of the dye-sensitized solar cell are improved significantly.However,it is noted that when the thickness of the dense layer is increased to 100nm the cell efficiency suddenly decreases.We can know that the change of the dense layer's thickness plays an important role in the improvement of dye-sensitized solar cell' s performance.