Preparation Of Hole Transport Layer And Electron Transport Layer Based On Spray Coating And Applications In Perovskite Solar Cells

Organic-inorganic hybrid perovskite solar cells（PSCs）have received much attention in recent years owing to their low manufacturing cost and excellent photovoltaic performance.As a new type of solar cell,perovskite solar cells show great potential to replace traditional silicon solar cells,but their commercial application still faces many problems.Optimizing and improving the preparation method of PSCs and finding new hole-transporting and electron-transporting materials are still the focus of current research.To deal with these problems,this thesis focuses on how to prepare high-efficiency and low-cost PSCs,and find efficient and low-cost hole-transport materials,and find electron-transport materials that can be prepared at low temperatures,and improve the preparation method of PSCs.Two parts works were carried out as follows:1.First,we prepared Cu₂O nanoparticles as hole transport layers for inverted perovskite solar cells.Cu₂O is a narrow band gap semiconductor,because of its high hole mobility,it is a promising inorganic hole transport layer material.We used a lowtemperature solution synthesis method to prepare Cu₂O nanoparticles and use it as the hole transport layers for inverted perovskite solar cells.Cu₂O nanoparticles were prepared as the hole transport layer by spin coating,and then make a complete PSCs device.It was found that the concentration of Cu₂O has a great influence on the PSCs device,and the power conversion efficiency of the optimized device can reach 9.4%.Based on the previous work,we prepared the Cu₂O film by spray coating and used it as the hole transport layer to prepare inverted perovskite solar cells.It was found that the performance of the Cu₂O film prepared by the spray coating is better than that of the spin coating.The highest power conversion efficiency reached 10.96%,and the device showed high uniformity.2.In this work,we report a universal low-cost spray coating process for the preparation of Sn O2 films in an air environment and use it to prepare an effective electron transport layer for PSCs.Specifically,dense and smooth Sn O2 films are produced by optimizing the spray conditions and film thickness to obtain the best PSCs.A dozen of devices fabricated from the same batch of spray-coated Sn O2 films showed similar high performance with an average efficiency of over 16%,demonstrating the reliability of the large-area Sn O2 films prepared by spray coating.The PSC based on a spray-coated Sn O2 film achieved a maximum conversion efficiency of 17.78%,which is almost the same as that of PSCs based on Sn O2 prepared by spin coating.Furthermore,the device based on the spray-coated Sn O2 effective electron transport layer showed similar device stability with the PSC based on Sn O2 prepared by spin coating.