钙钛矿型有机—无机杂化半导体材料的合成及其发光性质的研究的中期报告.docx

钙钛矿型有机—无机杂化半导体材料的合成及其发光性质的研究的中期报告

Abstract:

Inthismidtermreport,wepresentthesynthesisandphotoluminescencepropertiesofaseriesofhybridorganic-inorganicperovskitesemiconductorswiththegeneralformulaofABX3,whereAisamonovalentorganiccation,Bisadivalentmetalcation(suchasPb,Sn)andXisahalideanion.X-raydiffractionanalysisindicatesthattheas-synthesizedperovskitesamplesadoptacubiccrystalstructurewithspacegroupPm-3mandlatticeconstantarangingfrom6.3to6.7?.UV-Visabsorptionspectrashowthattheperovskitesampleshavebroadandstrongabsorptioninthevisibleandnear-ultravioletregions,withabsorptionedgerangingfrom400to700nm.Photoluminescencemeasurementsrevealthattheperovskitesamplesexhibitstrongemissionwiththepeakwavelengthrangingfrom550to800nm,suggestingtheirpotentialapplicationsinoptoelectronicdevicessuchaslight-emittingdiodes,solarcellsandlasers.

Introduction:

Hybridorganic-inorganicperovskitesemiconductorshaveattractedconsiderableattentioninthepastfewyearsduetotheirexceptionaloptoelectronicpropertiesandlowfabricationcost.Theyexhibitlongcarrierlifetimes,highquantumefficienciesandtunableemissioncolors,makingthempromisingcandidatesforvariousoptoelectronicapplications.TheABX3-typeperovskitestructureconsistsofcorner-sharingBX6octahedra,forminganinfinitethree-dimensionalnetwork,andAcationsresidinginthecavitiesbetweenBX6octahedra.TheAcationplaysanimportantroleindeterminingthestability,bandgapandopticalpropertiesoftheperovskitematerial.

Inthisproject,weaimtosynthesizeaseriesofA-sitemonovalentorganiccation-basedperovskitematerialsandinvestigatetheirphotoluminescenceproperties.Theorganiccationsusedinthisstudyincludemethylammonium(MA),formamidinium(FA),andphenylethylammonium(PEA).Thedivalentmetalcationusedislead(Pb),andthehalideanionu