Study On The Temperature-dependent Photoluminescence Properties And Photoelectric Properties Of Organic-inorganic Perovskite Materials

In recent years,organic-inorganic hybrid perovskite materials have been widely studied because of their excellent photoelectric properties.They have wide prospects in the fields of optics and optoelectronics,et al.The material has organic components and inorganic components.The structure of two components alternately stacked makes the material not only has the easy processing and photoelectric function of organic components,but also the stability of inorganic components.Although great progress has been made,there are still many problems to be solved.For example,their temperature-dependent PL characteristics,phase transition characteristics,exciton formation mechanism,stability and photoelectric properties,et al.The study will help promote further development of semiconductor materials and main research work is summarized as follows:?1?The temperature-dependent PL of organic-inorganic hybrid perovskite materials were studied,including the bulk single crystal?-FAPbI₃,?-FAPbI₃ nanorods and FA_xMA_1-x-x PbI₃?x=0.8,0.6,0.4,0.2?perovskite nanocrystals.Samples were synthesized by solution method,?-FAPbI₃ nanorods was gained by heating the yellow hexagonal phase?-FAPbI₃ and FA_xMA_1-x-x PbI₃ nanocrystals were black,showing cubic perovskite phase structure.The morphology and crystal structure of the samples were measured by SEM and XRD,respectively.The temperature-dependent PL spectra of the samples were tested.The band gap changes and phase transition were discussed.The integrated PL intensity decreases exponentially with the increase of temperature.By the analysis of integrated PL intensity,the exciton binding energy is fitted.In addition,the absorption was also disscussed.?2?We build the ITO/PEDOT:PSS/perovskite/PCBM/Ag structure of the perovskite solar cell by spin coating method,FA_xMA_1-x-x PbI₃?x=0.8,0.6,0.4,0.2?were used as the light absorption layer,surface morphology,cross section of crystal structure and crystal structure of perovskite layers were tested by SEM and XRD,respectively.Photoelectric parameters were also tested by solar cell testing system?J-V?.The best photoelectric conversion efficiency?PCE?can reach 9.7%.Those above results are of great guiding significance for further application of perovskite-based materials.