Synthesis And Photoelectric Properties Of Metal Halide Organic-Inorganic Hybrid Perovskite Materials

The organic-inorganic hybrid perovskite has received a lots of attention due to its simple synthesis steps,structural diversity,tunable band gap,and excellent optical,electronic,and thermal transport properties.Organic-inorganic hybrid perovskite is a new type of composite material which can unite the advantages of organic and inorganic components,result in a variety of interesting properties.Organic components contribute to a wide range of structures,enabling us to design and synthesize structures that suits our needs.Electrical properties origin from inorganic components,which can regulate the band gap of compounds,from conductors to semiconductors,even to superconductors or insulators.Moreover,inorganic components provide thermal transport and magnetic properties for the organic-inorganic hybrid perovskite.In recent years,many researches has been done on lead-based organic-inorganic hybrid perovskite,and its excellent photoelectric properties have shown a broad application prospect in the fields of photoluminescence and photoconductor.(1)Two cases isomorphic two-dimensional organic-inorganic hybrid perovskite crystals,[C₁₀H₁₆N]₄Pb₃Cl₁₀(Compound 1)and[C₁₀H₁₆N]₄Pb₃Br₁₀(Compound 2)were synthesized templated by benzyltrimethylammonium cation.Two compounds are connected by[Pb X₆]octahedrons through faces and cornor-sharing ways forming a unique two-dimensional structure.The distortion degree of the[Pb₃Br₁₀]^4-two-dimensional layer of compound 2 is higher than that compound 1.Higher distortion degree of compound 2 promotes the formation of self-trapped excitons,exhibits a broadband yellow emission peak and a large Stokes shift.The photoluminescence quantum efficiency(PLQY)of compound 2 is 2.53%,the PL lifetime is 1.25 ns,and the CIE coordinates are(0.57,0.43).(2)Three cases of one-dimensional organic-inorganic lead-based perovskite crystals,[C₇H₉N₂]Pb I₃·I₂(Compound 3),[C₈H₁₁N₂]Pb₂I₅(Compound 4),[C₇H₈N₂F]₂Pb₃I₈(Compound 5)were synthesized templated by benzamidine,4-methylbenzamidine and4-fluorobenzamidine,respectively.Compound 3 shows a dark color due to free iodine molecules in the crystal lattice.Iodine molecules in crystal lattice can significantly affect optical absorption and reduce defect density.By comparing the UV absorption spectra of the three compounds,compound 3 shows highly light absorption properties,with an optical band gap of 1.47 e V,narrower band gap improve photon capture,increasing the generation of photocurrent.Compound 3 crystal device exhibits stable photoelectric response,which has broad prospects in optoelectronic applications(3)Two organic-inorganic hybrid perovskite crystals,[4-C₁₂H₁₄N₂O₂S]₂Pb₃I₁₀(compound 6)and[3-C₁₂H₁₄N₂O₂S]Pb I₄·3H₂O(compound 7)were synthesized templated by diaminophenyl sulfone derivatives with different amino sites,4,4'-diaminophenyl sulfone and 3,3'-diaminophenyl sulfone,respectively.Two compounds exhibit different structures duo to different amine sites,Compound 6 has a two-dimensional layered structure,while compound 7 has a one-dimensional chain structure.The design,synthesis and structural characterization of two compounds were described,and the UV-vis and photoluminescence properties of compounds 6-7 were studied.