The Study On The Effect Of Perovskite Film,Hole And Electron Transport Layer On The Photovoltaic Performance Of Perovskite Solar Cells

International energy prices are rising under the influence of the tense international situation.The importance of energy security has become more and more prominent and has become an important part of national security.Therefore,actively optimizing China’s energy structure is currently being implemented and must always be adhered to.Photovoltaic power generation,as a representative of new clean energy,has become the focus of attention and research.Perovskite solar cell technology is one of the most concerned new solar technologies in recent years.After more than ten years of active research by researchers,the laboratory photoelectric conversion efficiency of perovskite solar cell has reached 25.7%,which is close to the current record of commercial monocrystalline silicon solar cell.However,there are still some significant problems to realize the industrial application of perovskite solar cells from the laboratory,such as further understanding the working mechanism of the cells,improving the long-term stability of the devices,simplifying the preparation process and reducing the production cost.Therefore,this paper will study the optimization of hole transport layer,electron transport layer,crystallization of perovskite films.And focus on their effects on the performance of devices and their related mechanisms.The specific research content of this paper is as follows:This section first uses the Hummers method to prepare GO nanosheets,then,the GO and PEDOT throughπ-πstacking and hydrogen bond interaction to form a conjugated system,then scattered in isopropanol,spin coated into a film to form hole transport layer.Studies show that the PEDOT-GO composite applied as a hole transport layer in perovskite solar cells with carbon electrodes significantly improves the photoelectric conversion efficiency of the device to 14.09%,comparable to the efficiency of devices using Spiro-OMe TAD as a hole material.In addition,PEDOT-GO composite can form a barrier layer,effectively protect the perovskite photoabsorption layer,and improve the long-term stability of the device.Therefore,this new hole transport material provides a new idea for the industrial application of perovskite solar cells.From the perspective of interface engineering,this chapter,β-Alanine is used as the interface modifier between the electron transport layer and the perovskite photoabsorption layer,as a bridge to adjust the interface charge transfer and perovskite crystallization dynamics,focusing on the impact of the interface modifier on the crystallization dynamics of perovskite.The experimental results show that under the action of interfaceβ-Alanine,the perovskite light absorption layer realizes highly directional growth and shows superior charge transport characteristics.At the same time,the addition ofβ-Alanine also greatly improves the interface performance between perovskite and electron transport layer and reduces the recombination of carriers.The device modified byβ-Alanine has achieved high reproducibility,the photoelectric conversion efficiency is 19.05%,and the hysteresis of the device is significantly reduced.Therefore,the introduction of interface modifier to improve the energy level matching between perovskite film and electron transport layer is conducive to electron transport,which is of great significance to improve the conversion efficiency of perovskite photovoltaic cells.The strategy of improving the quality of perovskite films by MA molecular treatment has made great achievements,but its real internal working mechanism is still controversial.However,are there differences in the effects of different MA molecular treatment processes on the morphology,structure and even properties of perovskite films?This key issue has not attracted enough attention and research.Therefore,we prepared high-quality perovskite films and corresponding devices through MA molecular treated raw materials（PbI₂and MAI powder）and MAPbI₃crystals.Focused on the related properties of the prepared perovskite films and their devices.The results show that compared with the precursor salt derived films,the crystal derived perovskite films show stronger（110）plane diffraction,indicating the preferred orientation along the（110）direction.At the same time,the device prepared by crystal derived perovskite film has better performance and reproducibility,and its PCE reaches 19.34%.This has important research value for promoting the next large-scale industrial production of perovskite films.