Research On Synthesis And Photodetection Applications Of CsPBX₃ Perovskites Quantum Dots

Combined quantum size effect and quantum confinement effect with high carrier mobility,long diffusion length,strong absorption,high luminescence efficiency and easy band engineering,inorganic perovskites quantum dots（IPQDs）or nanocrystals（IPNCs）has a promising application future in LED,QLED,laser,fluorescent probe,solar cells,etc.In this research,IPQDs was synthesized by hot injection method,supersaturation method and ion-exchange method which emission spectra was tunable over the entire visible spectral region of 410-700 nm.Two types of purifying method were explored to study the effect of surface ligand.TEM,absorption spectra and photoluminescence test indicated that as-synthesized QDs size is 20-50nm with PL spectra covering 410-700nm and FWHM within 17-35nm.Compared different synthesizing methods,the test result suggested that hot injection method has distinct advantage in luminance property and stability,however,other methods have higher synthesizing efficiency.Tests on purifying method revealed 2-3 times purifying can make a balance between device fabrication and maintaining of QDs properties.Based on photodetector principles and structures,photoconductive detector and PIN or PN junction photovoltaic detector were designed with CsPbBr₃ QDs as photosensitive material.The devices were fabricated by solution process and basically tested.The photodetection ability was discovered according to test result.