The Effect Of CdS And PC₆₀BM Incorporate In Perovskite Film On Perovskite Solar Cell Performance

Today,the energy issue is a huge problem for the whole human society.With the increasing depletion of fossil fuels,to find a new alternative energy sources is imminent.Solar energy as an inexhaustible source of renewable energy,is clean and pollution-free and meets the human needs for energy.Now,the main use of solar energy is the use of solar cells for photoelectric conversion.Solar cells have undergone several generations of development.Today,perovskite solar cells are favored by researchers because of the simple manufacturing process,low manufacturing cost,and high photoelectric conversion efficiency.The key factors for improve the performance of perovskite solar cells are the preparation of high quality perovskite films and the reduction of charge recombination inside the cells.This paper mainly focuses on these two factors,the effects of incorporate cadmium sulfide（CdS）and PC60BM in the perovskite layer on the quality of the thin film and the influence of the separation and transport of carriers inside the solar cells are investigated,respectively.Improve the photoelectric conversion efficiency of the solar cells.My research consists of the following components:First of all,we have made a systematic exposition of the development history and research status of perovskite solar cells,and explained the preparation process and working principle of perovskite solar cells.In order to improve the quality of the perovskite film,reduce the charge recombination in the perovskite layer and improve the power conversion efficiency of the device,we incorporated the CdS nanoparticles into the perovskite layer through the precursor solution blending method to prepare the ITO/CuInS₂/Al₂O₃/CH₃NH₃PbI₃:CdS/PCBM/Ag bulk heterojunction perovskite solar cells.Then,we systematically studied the effect of CdS incorporation on the quality and optoelectronic properties of the perovskite film,and further applied the scanning probe microscope,conductive atomic force microscope and Kelvin probe force microscope technology and Chemical impedance spectroscopy and other characterization methods thoroughly studied the effect of CdS incorporation on charge separation,charge transfer,and device performance of the device.Our results show that the proper amount of CdS can effectively improve the compactness and flatness of perovskite films,reduce the charge recombination in the active layer,and promote the charge transfer efficiency at the CuInS₂/CH₃NH₃PbI₃:CdS and CH₃NH₃PbI₃:CdS/PCBM interfaces.Improving the device performance.Secondly,on the basis of the previous work,we prepared an ITO/PEDOT:PSS（PH1000）/Al₂O₃/CH₃NH₃PbI₃/PC₆₀BM/Ag bulk heterojunction solar cell by incorporation of PC₆₀BM into the perovskite layer by anti-solvent method.Our results show that compared to using chlorobenzene as an anti-solvent,the performance of devices using PC₆₀BM as an anti-solvent is greatly improved.The main reason is that the PC60BM as an electron transport material has effectively promoted the separation and transfer of carriers in the CH₃NH₃PbI₃film,thereby improving the photovoltaic performance of the solar cells.Finally,Our work is summarized.Our research provided a new way for improve the performance of perovskite solar cells.