Optimization And Combination Of Two-dimensional And Three-dimensional Perovskite Solar Cells

Metal Halide perovskite materials have developed rapidly in the past ten years.The photoelectric conversion efficiency of perovskite solar cells has exceeded 25% with the continuous deepening of perovskite research.Researchers have attracted widespread attention because of its exceptional photoelectric properties,.However,the large-scale application of this kind of battery is required to solve some problems:(1)the stability is relatively poor.In addition to the unstable structure and easy degradation of the perovskite itself,the instability of other structural layers of the perovskite device,and the ion diffusion between them,chemical reaction,etc.will also result from degradation of the device efficiency.(2)the lead element in perovskite materials is not friendly to people and the environment.This is also a big challenge.(3)Industrialization requires a large area applies.At present,large area preparation technology of perovskite is comparatively backward and the device efficiency is low.This article is devoted to understand the structure and properties of two-dimensional perovskite,three-dimensional perovskite and their binder.The main research contents are as following:1.RP perovskite based on 3-PyA cation is regulated by the composition of small and large cation combinations.XRD,SEM and other structural characterization methods were used to analyze the evolution of crystal properties and surface morphology of the films.It is revealed that the cations within the layer have a great influence on the band gap,while the cations outside the layer have a greater influence on the phase distribution,and had almost no influence on the band gap.We achieved 12.4% photoelectric conversion efficiency through two-step cationic combination,which is 50%higher than that of single cationic control.2.3D perovskite based on FACS was studied by adding BDAI macromolecules into 3D perovskite Crystal evolution and photoelectric properties of its thin film.Through UV-visible light analysis and XRD,it can be clearly found that low-dimensional perovskite is formed after adding BDAI,and it is speculated that BDAI and excessive lead iodide passivate the grain boundary,reduce the lattice stress,slow down the degradation of the film,and promote the device to show long-term stability.An efficiency of more than 22% was obtained and 90% of the initial efficiency was retained for more than 1400 hours at a humidity of 30% to 50%.It provides more data support for mixed perovskite applies.