The Study Of Dye-sensitized Solar Cells Based On Indium-doped Hydrotalcite-like Compounds

A class of layered materials consisting of two or more metallic elements with different valence states is called Hydrotalcite-like compounds(HTlc).Due to its unique structure and unique physical and chemical properties,it has been widely used in medicine,catalysis,adsorption,energy storage and other aspects.Research on Dye Sensitized Solar Cell(DSSC)has been a research hotspot in research on Solar cells,due to its characteristics of low manufacturing cost,simple manufacturing process and high efficiency.As an important component of dye-sensitized solar cells,photoanode materials have attracted much attention recently.Our research group has been working on a new type of solar cell based on hydrotalcite.The composite metal oxides were synthesized from hydrotalcite and used as photoanode materials for dye-sensitized solar cells.The synthesis method is simple,the source of raw materials is wide and cheap,and the mixed metal oxides synthesized by this method have the characteristics of uniform size,large specific surface area and high light utilization rate,so the cell efficiency made by this method has been greatly improved.The practice has proved that the method of using hydrotalcite as the precursor material for the preparation of photoanode is feasible and efficient,which also adds a new research idea and method to the existing technology for the preparation of DSSC photoanode material.In this paper,the preparation of ZnTi-LDH and ZnSn-LDH by urea method and the ZnTiIn-LDH and ZnSnIn-LDH were also studied,and the corresponding mixed metal oxides were obtained by calcining the LDH material acting as the precursor.X-ray diffraction(XRD).、scanning electron microscopy(SEM)and transmission electron microscope(TEM)were employed to characterize the structure and morphology of materials.The MMO was served as the photoanode material of DSSC,C101 and Z907 dyes were selected as sensitizing agents,and the photoelectric efficiency of cells is improved by doping indium.(1)ZnTi-MMO was prepared by calcining ZnTi-LDH serving as precursor material at high temperature and applied in DSSC as photoanode material.By adjusting the original feed ratio of Zn2+ and Ti4+ to obtain the corresponding mixed metal oxide.The influence of the mole ratio of Zn2+ and Ti4+ and the difference of sensitizer on the cell performance were analyzed by electrochemical test.(2)On the basis of the preparation of ZnTi-LDH,ZnTiIn-MMO with different doping contents of indium were obtained and the successful doping of indium was confirmed by the test of EDS and SEM.The relationship between different indium doping content and solar photoelectric performance was studied.By comparing the efficiency of the solar cell based on zero indium doping material,the introduction of indium greatly improves the properties of short circuit current and photoelectric efficiency of the cells.It was found that the best photoelectric performance was achieved when the indium doping content was 2%,but efficiency decreased if the doping content was too high.The influence of indium doped content on the basic photoelectric parameters such as lifetime and composite impedance was studied.(3)The mixed metal oxides prepared with ZnSnIn-LDH acting as the precursor played the part of the photoanode materials of DSSC,and the impacts of different indium doping contents on the photoelectric performance of the cells were discussed.It was found that when indium doping content is 1%,the cell efficiency gets the best photoelectric performance.Compared with cell made with undoped indium zinc-tin composite oxides,the efficiency of DSSC nearly tripled from 1.27%to 4.19%.