Study On The Stability And Photoelectric Properties Of Perovskite Materials

Perovskites have received attention in the past few decades due to their excellent photoelectric properties and have become a candidate for solar cell application after silicon semiconductor.High photoluminescence efficiency,low trap density and long carrier diffusion length are of benefit to application in lasers,photoelectric detection,LED and other devices.However,the working lifetime of devices tend to be reduced because perovskite is easily affected by water molecules in the air,oxygen,or ultraviolet,etc.Researcher reports lots of ways to improve the stability of perovskite,including coating polymers with organic molecules.But the coating materials are usually PS,PMMA,etc,which are not conductive to the application of electrical devices.Therefore,the way to synthesis perovskite with high stability for devices is extremely significant.An easily and environmental friendly aqueous synthesis technology of MAPbX₃@PbOHX was reported.It has excellent photoelectric property for applying in photoelectric devices.The main works are as follows:（1）An aqueous synthesis method to prepare MAPbBr₃@PbOHBr,which has 58%PL quantum yield.It still preserves 71.6%initial PL intensity after five recycles.The MAPbBr₃@PbOHBr has good stability,whatever in air,water or other polar solvent.Moreover,the luminescence mechanism and photoluminescence lifetime are discussed.The White LED has a high color rendering index of 73.3.Finally,the application of MAPbBr₃@PbOHBr in electroluminescent devices and photoelectric detectors can also be realized.（2）The synthesis of MAPbI₃@PbOHI has also been reported on the basis of the preparation of MAPbBr₃@PbOHBr.The MAPbI₃@PbOHI has high photoluminescence at750nm.At the same time,the MAPbI₃@PbOHI applied in the photoelectric detector also has responsive,which h can reach the switching ratio of 50.35.The material has important reference value for the application of stable solar cells in the future.