Giant Enhancement of Carrier Mobility in Bimetallic Coordination

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1、ThisisanopenaccessarticlepublishedunderanACSAuthorChoiceLicense,whichpermitscopyingandredistributionofthearticleoranyadaptationsfornon-commercialpurposes.Articlehttp://pubs.acs.org/journal/acsodfGiantEnhancementofCarrierMobilityinBimetallicCoordinationPolymers††BarunDhara,VikashKumar,Kri

2、tiGupta,PlawanKumarJha,andNirmalyaBallav*DepartmentofChemistry,IndianInstituteofScienceEducationandResearch(IISER),Pune411008,India*SSupportingInformationABSTRACT:Electricallyconductivemetal−organiccoordinationpolymers(CPs)arepromisingcandidatesforavarietyoftechnologicalapplications.Howe

3、ver,poorenergeticandspatialoverlapbetweenthesp-electronsoforganicligandsandthed-electronsofmetalionoftenblocksaneffectivechargetransport(mobility)acrossCPs.Herein,wepresentabimetallicdesignprincipleforenhancingcarriermobilityinCPs.BimetallicCPsofFe(III)andCr(III)ionscoordinatedto1,3,5-ben

4、zenetricarboxylicacid(BTC)ligand(Fe−BTC−Cr)exhibitedremarkablyhighcarriermobilityatthematchingmoleratio(1:1)withenhancementfactorsof102and104incomparisontothoseofmonometallicparents,Fe−BTCandCr−BTC,respectively.Theobservationwassubstantiatedbyloweringofthebandgapbetweenthevalencebandandt

5、heconductionbandupontheformationofahybridp−n-typestructureinthebimetallicCPs.ThedirectcurrentconductivityvaluesoftheCPsmeasuredbyfour-probetechniquewereingoodagreementwiththealternatingcurrentconductivityvaluesobtainedfromtheelectrochemicalimpedancespectros-copy.Ourflexibleapproachofpicki

6、ngandchoosingtheappropriatecombinationofmetalionsfromtheperiodictableisexpectedtogeneratevariousCPswithdesirablesemiconductingproperties.1.INTRODUCTIONanddensityvalues,alsodetaileddiscussionsovertheimportantsemiconductingparameterswerescarcelyunveiledintheviewExploringnewmaterialswithdes

7、iredfunctionalitiesareofasimpleequation:σ=ηeμ(whereσistheconductivity,ηisdemandinginthedominanceofSi-basedmaterialsupon131thecarrierdensity,andμisthecarriermobility).Stimulatedinceptioninthesemiconductorindustry.Variousinorganic-fromtherecentprogressandvisualizingthetunin