Study On The Preparation And Modification Of Carbon Counter Electrode For Perovskite Solar Cells

Since 2009,T.Miyasaka et al.introduced the perovskite material?MAPbX₃?as a solid dye into a porous TiO₂ layer to fabricate dye-sensitized solar cell for the first time.The efficiency of Perovskite solar cells?PSCs?has been steadily improved.At present,it has reached 22.7%.The materials for solar cell are rich,there are many advantages for the perovskite solar cells,such as low costs,relatively simple preparation process,and high photoelectric conversion efficiency.It has become a research hotspot for perovskite solar cells in the field of new energy power generation.The counter electrode is an important part of the perovskite solar cell,and its role in the device is to collect photogenerated holes to reduce the recombination loss.Therefore,as the counter electrode material,its work function is required to match the energy level of the highest occupied orbital?HOMO?of the perovskite material and the counter electrode material should have a good conductivity and stability.At present,the counter electrode materials of perovskite solar cell are usually made of noble metals?such as Au,Ag,etc.?and the noble electrode is prepared by high vacuum evaporation,the preparation of the cost is relatively expensive,which isn't conducive to large-scale commercial applications.In order to further reduce the cost without sacrifice higher photoelectric conversion efficiency,many researchers began to use low-cost carbon materials as the battery's electrode.However,there are few studies on the preparation of composite electrodes using different types of carbon materials,which need to be further regulated and optimized.In order to solve the current problems of carbon counter electrodes,this paper used graphene or carbon nanotube with high specific surface area and excellent electrical conductivity to modify the mesoporous carbon materials to prepare high-efficiency counter electrodes,and discusses the performance influence of conventional carbon electrodes on the mixing ratios of different carbon materials to design and prepare high-efficiency perovskite solar cells,thereby reveal the rapid extraction mechanism of interface charge.SEM,UV-Vis,XRD,specific surface area test,contact angle test,square resistance test,EIS electrochemical impedance test,J-V test,IPCE test,stability test and other analytical testing methods were used to analysis the surface morphology?Low-light structure?light absorption characteristics?specific surface area and electrochemical characteristics.The main research content is as follows:?1?A porous conductive carbon film was prepared using graphene mixed bulk graphite/carbon black,and by adjusting the doping ratio of graphene,the resistance of the film,the specific surface area,and the infiltration of the perovskite solution were investigated,a carbon counter electrode with superior performance was obtained.At the same time,a perovskite solar cell based on graphene-doped carbon electrode was designed and prepared.The photoelectric performance test showed that when the addition amount of graphene was 5%,the battery performance was optimal,and the photoelectric conversion efficiency was up to 12.62%.?2?Porous carbon electrode was prepared by using carbon nanotubes.By characterization analysis of film square resistance,specific surface area and electrochemical impedance spectroscopy.the effect of battery performance based on modified mesoporous carbon electrode with carbon nanotubes was studied.By optimizing the carbon nanotube doping amount,we have prepared a perovskite solar cell based on carbon electrode with a photoelectric conversion efficiency of 13.67%.