Preparation And Optical Properties Of Organic And Inorganic Hybrid Perovskite Single Crystal

Organic-inorganic hybrid perovskite material CH₃NH₃PbX₃?X=Cl,Br,I?has been widely used in solar cells,photodetectors,light-emitting diodes and lasers,and has become a hot spot for scientists in recent years.Single crystal with low defects,long carrier diffusion length,and small thickness of the absorption layer,has more complete structure than the film,,it could theoretically further improve the performance of optical devices,in order to make up for the lack of understanding of the physical properties of single crystals,this paper used the inversion method to prepare CH₃NH₃PbX₃?X=Cl,Br,I?single crystals,and studied the dispersion,phase transition and photodetection of crystals.The crystal-related physical properties are instructive for the design of the device.This Article analyzed crystal growth process and compared the effects of halogen elements on the absorption and reflection spectra of single crystals.The crystal has good light transmittance in the near-infrared light band,the refractive index of the single crystal is measured and the dispersion curve of the crystal is fitted,the results show that CH₃NH₃PbX₃?X=Cl,Br,I?has similar dispersion behavior can be described by the dispersion parameter E0/S0=1.25 evm²,but with different optical properties from inorganic perovskites.The phase transition of temperature-induced crystals was studied by XRD,DSC and dielectric.The parameter of crystals unit cell at different temperature shows that the phase transformation process of crystals is reversible and accompanied by the absorption and release of heat.Cellular distortion causes a sudden change in the dielectric properties of the crystal.This paper explains the dielectric abrupt behavior of the crystal by the deflection of the dipole.Different CH₃NH₃PbBr₃ single crystals were prepared by adjusting the organic components in the precursor solution in this paper,the effects of organic components in the precursor solution on the fluorescence spectrum and detector performance of CH₃NH₃PbBr₃were compared.The results show that the content of organic components in the precursor solution can change the crystal.The emission spectrum can effectively improve the responsiveness and external quantum efficiency of the perovskite photodetector by increasing the content of organic components in the precursor solution.