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1、APPLIEDPHYSICSLETTERSVOLUME81,NUMBER11JULY2002Electronicand?eldemissionpropertiesofboronnitride?carbonnanotubesuperlatticesa)VincentMeunier,ChristopherRoland,andJ.BernholcDepartmentofPhysics,NorthCarolinaStateUniversity,Raleigh,NorthCarolina27695MarcoBuongiornoNardell
2、iDepartmentofPhysics,NorthCarolinaStateUniversity,Raleigh,NorthCarolina27695andCenterforComputationalSciences(CCS)andComputationalScienceandMathematicsDivision,OakRidgeNationalLaboratory,OakRidge,Tennessee37830~Received19March2002;acceptedforpublication13May2002!BN/Cn
3、anotubesuperlatticesarequasione-dimensionalheterostructuresthatshowuniquephysicalpropertiesderivedfromtheirpeculiargeometry.Usingstate-of-the-artabinitiocalculations,weshowthatBN/Csystemscanbeusedforeffectiveband-offsetnanodeviceengineering,polarization-baseddevices,a
4、ndrobust?eldemitterswithanef?ciencyenhancedbyuptotwoordersofmagnitudeovercarbonnanotubesystems.?2002AmericanInstituteofPhysics.@DOI:10.1063/1.1491013#Thediscoveryofcarbonnanotubesasamaterialwithtubes,theheterojunctionwillbehaveasaSchottkydiode.outstandingmechanicaland
5、electricalpropertieshasledtoaThus,combiningtheBNandcarbonnanotubesofvariousquestforothergraphene-basedstructureswithtechnologi-helicitiesoffersabroadrangeofopportunitiesforband-callydesirableproperties.Theclosely-relatedboronnitrideoffsetengineeringandfortheconstructi
6、onofdifferentnano-~BN!nanotubesandmixedBN/Csystems,1±6whicharenowtubularheterojunctions.beingproducedingramquantities,haveelectronicpropertiesTurningtothemoreuniqueaspectsoftheelectronicthatarecomplementarytopurecarbonnanotubesandcouldproperties,themajorityofBN/Cnanot
7、ubesuperlatticesarethusbeusefulinavarietyofelectronicdevices.Indeed,ancharacterizedbyaspontaneouspolarization?eld,whichisaearlytheoreticalstudysuggestedBN/Cjunctionsasapoten-directconsequenceofthepolarnatureoftheB±Nbondandtiallypracticalwaytorealizestable,nanoscalethe
8、lowsymmetryoftheunderlyinglattice.Inaperiodicheterojunctions.7Veryrecently,BNnanotubeshavebeensuperlatticeofpolarandnonpolar
