Research On Preparation And Modification Of Nanomaterials Based On Fast Ion Conductor RbAg₄I₅ And Its Application

This thesis starts from the structure of fast ion conductor RbAg₄I₅,discusses the effect of fast ion conductor’s conductivity model and three-dimensional structure on conductivity,and has a more in-depth understanding of the application of fast ion conductor RbAg₄I₅,making full use of its high ion conductivity High efficiency and stable silver nanostructures are prepared by combining the ordered grating-like structure;the fast ion conductor is used to modify the interface of the perovskite film material,and the influence on the morphology,structure and grain of the perovskite film is discussed.,Which in turn affects the photovoltaic performance of perovskite battery devices.The main research results are as follows:（1）The RbAg₄I₅thin film was prepared by the vacuum thermal evaporation method,and the conduction mechanism and the conduction model of the RbAg₄I₅three-dimensional structure were analyzed.The use of it as a silver ion transport channel in the preparation of ordered silver nanostructures was studied.Under the constraints of the grating-like structure,a highly ordered,uniform and efficient silver nanostructure was obtained.The results show that the silver nanostructure prepared by the solid-state ionology method under the action of the grating-like structure has an enhancement factor of 1.0×10⁸,which is nearly an order of magnitude higher than the enhancement factor of 2.7×10⁷without the grating-like structure..The silver nanostructures prepared under the two conditions were placed in a dry box with an ambient temperature of 25°C and a humidity of 30%.After 100 days,the silver nanostructures prepared without the grating-like structure maintained 79.2%of the initial enhancement effect.The silver nanostructure prepared by the grating structure maintains 90%of the initial enhancement effect.In addition,using the silver nanostructures prepared under the condition of a grating-like structure as the substrate for surface enhanced Raman spectroscopy can accurately detect the vibration information of the molecules in the ss DNA chain.（2）Thanks to the efficient carrier transport efficiency of RbAg₄I₅,a layer of RbAg₄I₅film is evaporated between the hole transport layer and the perovskite layer of the perovskite battery by vacuum thermal evaporation.The effect of the RbAg₄I₅film on the perovskite film is explored.And battery devices.After evaporation of RbAg₄I₅,it effectively enhances the transport of holes and prevents electrons from entering the hole transport layer.Further characterization found that when RbAg₄I₅is evaporated and interacts with the perovskite film for a period of time,the perovskite film becomes flatter,Dense,promotes the recrystallization and enlargement of perovskite crystal grains,further reduces the defects in the perovskite film,improves the efficiency of photo-generated carriers,and directly affects the photovoltaic performance of the cell.Compared with the original device,the photoelectric conversion efficiency of the battery device with vapor-coated RbAg₄I₅interface modified perovskite has increased from 16.24%to 17.71%.When the battery device with a layer of RbAg₄I₅film vaporized and the original device is placed in the same and certain For 1000 h in the environment,the original battery can only maintain 58%of the initial level,while the RbAg₄I₅modified battery device can maintain 83%of the initial level...