Application Of Pyrolysis Products Of Ni-Al LDHs In Perovskite Solar Cells

Compared with traditional fossil energy,solar energy is a green resource that supports the sustainable development of society and economy in the future.The development of solar cells is one of the important ways to solve energy problems.Three generations of batteries have been developed.In 2009,MAPbI3(MA:CH3NH3+)hybrid perovskite solar cell was first reported,and its excellent photoelectric conversion efficiency has become the biggest hot spot in solar cell research and development in the past decade.Existing researches mostly focus on the optimization of active layer performance.However,the performance optimization of the electron/hole transport layer of the battery and the preparation process are insufficiently studied.This paper focuses on the key issues of poor stability of active layers of hybrid solar cells.Carrying out research on the preparation of TiO2 electron transport layer of battery,using spin coating method and dipping method to prepare TiO2 as the electron transport layer,and also using TiO2 nanorods as the electron transport layer,and discuss its impact on cell efficiency.Furthermore,the pyrolysis product NiAl MMO of NiAl-LDHs(layered composite hydroxide)was used as the hole transport layer of the solar cell.By optimizing the product composition and pyrolysis temperature,the important role of structural memory effect in stabilizing the solar cells efficiency was explored.Specific research contents are:(1)Explore the influence of the TiO2 dense layer prepared by dip-coating and spin-coating method on the perovskite solar cell.At the same time,the effect of TiO2 nanorods as an electron transport layer on cell performance was also explored.Then use a one-step method to prepare the perovskite layer and assemble the battery.By comparison,the dense layer of TiO2 prepared by dipping and pulling method has better uniformity and can be more flatly laid on the substrate.At the same time,the photoelectric conversion efficiency of the dipping and pulling method is higher than that of the spin coating method,reaching 9.57%,Voc=0.94V,Jsc=19.91mA/cm2.(2)Ni-Al LDHs prepared by different metal ions were prepared by urea method.The pyrolysis products(Ni-Al MMO)at different temperatures and their structural memory effects were studied and introduced into the perovskite solar cell as a hole transport layer.Studies have shown that batteries using NiAl MMO as the hole transport layer can have a maximum photoelectric conversion efficiency of 10.87%,Voc=0.91V,and Jsc=22.5 mA/cm2.And after being exposed to the air for 10 days,the efficiency is still higher than that of the MMO-free battery.It shows that the structure memory effect of NiAl MMO is effective to protect the active layer of perovskite.