Study On Radiation Effect Of Lead Halide Perovskites Nanocrystals That Encapsulated In Amorphous Glass

Halide perovskites have a wide range of applications in the field of optoelectronics,such as perovskites solar cells,perovskites ray detectors,and light-emitting diodes due to their excellent optical properties.However,in practical applications,they were susceptible to the sensitive sources of water and oxygen,while in space they can largely avoid the above-mentioned problems and have great potential in the space environment.Photovoltaic devices would operate in a complex space environment where the interaction of various high-energy particles and rays with the materials and devices could cause degradation of structure and performance.Perovskites layers with excellent resistance to particle and radiation irradiation and stable photoelectric conversion performance have been the intrinsic driving force for their space applications.Since there was no uniform explanation for the irradiation effect of perovskites.For example,both moisture and oxygen in the air may damage the structural integrity of the perovskites.Therefore,it is desired to eliminate the potential interferences in evaluating the radiation tolerance of the perovskites.In this work,we prepared all-inorganic perovskite nanocrystals(CsPbBr3 NCs)that encapsulated in the amorphous glass matrix,which provided an ideal environment to isolate the moisture and air.The main research of this paper was as follows:(1)Irradiation effects on perovskites nanocrystals encapsulated in amorphous glass was investigated using 60Co-γ-ray.The gamma-ray irradiation effect of these spatial confined CsPbBr3 NCs was investigated by monitoring the changes in microstructure and optical properties.The microstructure of the CsPbBr3 NCs showed excellent irradiation stability at the low dose,but the decomposition of the perovskites structure was observed at the higer dose.In terms of optical properties,the photoluminescence intensity reflected a trend of increasing and decreasing photoluminescence intensity.The reasons for the increasement in luminescence intensity were investigated by time-resolved photoluminescence spectroscopy,temperature-dependent photoluminescence spectroscopy,Monte Carlo,and first-nature principle.Further studies revealed that this phenomenon was caused by the competitive mechanism between the decomposition and defect passivation induced by growth of fresh surface under the gamma-ray irradiation.(2)We investigated the irradiation effect of different doses of electrons on perovskites nanocrystals encapsulated in amorphous glass.From the macroscopic point of view,the colour of irradiated perovskites was significantly darker,which was a reflection of the color center.And microstructurally,on one hand,the color centering is obvious in the glass matrix,and on the other hand,the CsPbBr3 NCs show structural decomposition and aggregation.In addition,the optical properties of CsPbBr3 NCs were significantly damaged,with a decrease of about 50%in optical performance.In order to further verify the effect of color centering and structural decomposition on their optical properties,CsPbBr3 NCs were subjected to high temperature annealing.The color of CsPbBr3 NCs was restored after annealing,and the peak positions of the luminescence peaks were also normalized,indicating the reduction of the color centers.The optical properties were not restored after annealing,indicating that the presence of color centers did not destroy the optical properties and that the collapse of the microstructure was the main reason for the photoluminescence intensity after electron irradiation.