| As a clean green energy conversion and storage technology,the energy utilization rate of solar cells perovskite gradually increased.In addition to its excellent prospects in the field of solar energy,it also has endless potential for use in lighting and display fields.However,there are also problems such as the discontinuous synthesis of perovskite materials and the difficulty in controlling the products to be solved.In this paper,the perovskite material synthesis process was improved based on the microreactor,and the perovskite CsPbBr3 was successfully synthesized.The performance of the reaction product was analyzed and discussed using multiple characterization methods,and the entire fluid was simulated by COMSOL Multiphysicss oftware.The hybrid synthesis process was simulated,and the parameters obtained from its characterization results were used for calculation and analysis.For details,see below:(1)Through the use of COMSOL Multiphysicss software to simulate the segmented flow model,the feasibility of the microfluidic device was verified.First,the dynamic grid-diluted material transfer model is used for calculation.The internal mixing reaction process in the liquid phase of the gas-liquid-two-phase split-flow microreactor is faster.From the beginning of contact mixing to the mixing,the mixing is basically completed in seconds,according to Its advantages of injection,mixing,and advancing can keep the mixing scale completed under approximately uniform conditions,and then maintain the continuous production of fast-reacting products like perovskite.(2)The credibility of the parameters obtained by the simulation was further verified by calculation and calculation,indicating the flow mixing of the whole process,and the analysis of the separation(IOS)value with time was first increased sharply and then gradually decreased.The relationship between the total flow rate in the tube and the IOS value.As the volume ratio of toluene solvent and precursor solution affects IOS,as the reaction concentration decreases,this value also tends to decrease slowly.Using the calculation of the axial diffusion coefficient Dax,the effects of the inlet velocity on Dax were analyzed separately.The greater the velocity,the more intense the axial diffusion of the system and the better the internal mixing effect of the fluid;the increase in the length of the gas column passes through the liquid column.The flow velocity of the separating liquid column increases at the time of exacerbating the axial diffusion effect of the liquid column.(3)Based on simulation calculations,research on the preparation of all-inorganic perovskites,using a self-built separate flow-microfluidic reaction device to prepare perovskite CsPbBr3,through the advantages of easy control and continuous preparation of the device,high quality is prepared The perovskite CsPbBr3 has a narrow particle size distribution and luminous effect.Specific properties include:① The average diameter of the prepared perovskite CsPbBr3 is 6.8 nm,the dispersion is good,and the measured spectral wavelength is about 520 nm.② As the volume ratio of the fluid increases from 5:1 to 50:1,the size of the synthesized CsPbBr3 decreases by 2 nm;under the conditions of good mixing effect,the particle size distribution of the CsPbBr3 as the flow rate changes overall The effect is not large,in the range of 7～8 nm.③By analyzing the fluorescence luminescence spectrum performance of the obtained product,under the condition of the same flow rate,they all have the intrinsic luminescence peak at 520 nm,and with the increase of the concentration,the reaction concentration is the same,and the mixing scale is also excellent.The velocity of the reaction flow decreases,keeping the spectral peak at 522 nm. |
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