throughout x-ray diffraction

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1、throughoutX-rayDiffractionCHEM.RES.CHINESEU.2007,23(1),1__4ArticleID1005-9040(2007)1-00l434Availableonlineatwww.sciencedirect.com懦ScienceDirectStudiesonCrystalOrientationofZnUsingHigh-throughoutX-rayHOUChang.min.HUANGKe.kq,GAOZhong.min,LIXiang—shah,FENGZHANGYuan.tao.ZHUHui.chaoa

2、ndDUGuo.tonghireShou.hua'一,1.StateKeyLaboratoryofInorganicSynthesisandPreparativeChemistry,CollegeofChemistry,2.CollegeofElectronicScienceandEngineering,JilinUniversity,Changchun130012,P.R.ChinaReceivedApr.26,2006I1leorientationofthenano—columnarZn0filmsgrownonsapphireusingthete

3、chniqueofmetal-organicchemicalvapordeposition(MOCVD)exhibitsdeviationbecauseofthemismatchbetweenthecrystallattieesofthefilmsandthesapphiresubstrate.Ahish—throughoutX-raydiffractionmethodwasemployedtodeterminethecrystalorientationoftheZn0filmsatatimescaleoftheorderofminutesbasedo

4、nthegeneralareadetectiondiffractionsystem(GADDS).111israpid,effective,andreadymethod,adaptedforcharacterizingtheorientationofthenano?columnarcrystalsisusedtodirectlyexplaintheresultsofobservationoftheX—raydiffractionimages.bythemeasurementsoftheorientationsofthecrystalcolumnsoft

5、lleZnOfilmsalongcaxisandinparalleltoabplane.KeywordsOrientation;ZnOfilms;MOCVDIntroductionItiswellknownthatZnO,awideband—gapsemi—conductor,isapromisingmaterialbecauseofitswidebandgapof3.37eVatroomtemperature(RT)anditslargeexcitonicbindingenergyofabout60meV;itcanbeusedtopreparehi

6、gh--efficiencyultravioletopticalde—vices.Infact,opticallypumped,excitoniclasingfromZnOatRThasbeenreported'andexcitonicstimula—tedemissionshavebeenobservedattemperaturesashighas550KandatRT[?引.Severaltypes0fmethodsa】[eusedtoprepareZnOfilms.suchaspulselaserde—position(PLD)[5J,molec

7、ularbeamepitaxy(MBE),radio—frequencymagnetronsputtering(RFMS),andmetal-organicchemicalvapordeposition(MOCVD).TheMOCVDtechniquehastheadvantagesofhighefficiencyofcrystalgrowth,alargeareaofdeposition,andapromisingapplicationintheindustryHowever,considerablemisorientationsofthecrys—

8、talcolumnsoftheZnOfilmswereobservedinnaturebeca