Optimization Of Preparation Process Of Perovskite Solar Cell And Its Research With CIGS Tandem Solar Cell

As a third-generation solar cell,perovskite solar cells have attracted great attention from researchers due to their excellent absorption capacity and high carrier mobility.The power coversion efficiency raises from the initial efficiency of 3.8%to 24.2%in these ten years,which is currently the most promising solar cell.However,the preparation process of perovskite solar cells and the efficiency limit of single-cell batteries also restrict its development and large-scale application.First of all,as the most common and efficient way to prepare perovskite solar cells,spin-coating is one of the main reasons for limiting the industrial application of perovskite solar cells due to the inability to prepare large-area batteries due to process problems.Secondly,as a result of the efficiency limit of single-junction solar cell which perovskite solar cells are also facing,and the absorption spectrum of single-cell batteries is too narrow,causing the solar spectrum failed to be fully utilized.This paper mainly studies the above two issues:1.Preparation of perovskite solar cell based on blade-vacuum assisted crystallizationWe design a generic crystallization strategy that allows the controlled growth of highly qualitative perovskite films via a one-step blade coating.Through rational MACl ratio in combination with a facile vacuum-assisted pre-crystallization strategy under normal temperature,we are able to produce dense and uniform perovskite films with high crystallinity on large-areas.The results show that the incorporation of MACl contributes to produce larger-sized perovskite grains,and the higher the content,the larger the perovskite grains obtained by film formation,but the higher the content,the larger the grain gap.The universal application of the method is demonstrated at the hand of three typical perovskite compositions with different bandgaps.We also prepared a highly efficient trans-structured perovskite solar cell with a photoelectric conversion efficiency of 18.06%and a fill factor of 80%,underpinningour statement on the importance of controlling crystallization dynamics.2.Monolithic perovskite/CIGS tandem solar cell with nanostructuresWe presented a nanostructured monolithic perovskite/CIGS tandem solar cell with designed ITO dielectric nanocones and Ag hemisphere nanoparticles on both surfaces of the device.Our analysis illustrates the fact that the ITO nanocones on top can improve the absorptionof each subcell due to the light trapping and antireflection,whereas the rear surface Ag nano-particles play the important role of promoting light absorption only in the CIGS bottom subcell owing to the plasmonic scattering effect.Through harnessing the active and effective scattering and antireflection mechanisms by tuning the nanostructure feature size and surface coverage,the device J_SCC enhancement as high as 12.5%can be delivered,leading to a dramatic CIGS thickness reduction from 3750 to 1550 nm.This approach provides a viable way for achieving high-performance thinner perovskite/CIGS tandem solar cells,which can also be applied to other types of tandem thin-film solar cells.