过渡族元素掺杂ZNO稀磁半导体薄膜的生长及其性能研究

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1、浙江大学材料系硕士学位论文过渡族元素掺杂ZnO稀磁半导体薄膜的生长及其性能研究姓名：王雪涛申请学位级别：硕士专业：材料物理与化学指导教师：朱丽萍20100301浙江大学硕十学位论文AbstractDilutedmagneticsemiconductor(DMS)hasattractedgreatattentionduetoitspotentialapplicationsinspintronics．Dilutedmagneticsemiconductors(DMSs)areformedbypartialsubstitution

2、ofthecationsofthehostsemiconductorswithsmallamountofmagnetictransition—metal(TM)ionssuchasV，Cr，Mn，Fe，Co，andNi．Withchargeandspindegreesoffreedominasinglesubstance，DMSshaveattractedagreatdealofattentioninrecentyearsasenablingmaterialsintheemergingfieldof“spintronics”

3、，suchasmanufacturehigh-densityinformationmemory，logicdevicesandthespin-polarizedlighttransmitterofultra—lowenergyconsumption，whichareoptical，electricalandmagneticintegratednewdevices．Amongallthesesoxides，ZnObelongstothelistofthemostsuitablebuildingblockmaterialsfor

4、spintronicsapplicationduetoitsabundanceandenvironmentfriendlynatureandalsoduetoitspotentialasasuitableoptoelectronicmaterialwithawidebandgap(3．37eV)andahighexcitonbindingenergy(60meV)．ZnOhasSOmanyadvantages，andWasappliedwidelyandeffectively．Buttherearemanyarguments

5、fortheoriginofthemagnetization．Themaintaskistoclearlytherelationshipbetweenthecarriersandthemagnetization．Inthisthesis，basedontheintroductionofpastandcurrentresearchonZnO—baseddilutedmagneticsemiconductormaterialsanddevices，transitionmetalionsdopedZnOthinfilmsarepr

6、eparedbyPLDontheSi(100)，quartzandglasssubstrates．Themainresearchworkareasfollows：ThepreparationandcharacterizationofNidopedZnOthinfilms．TheNidopedZnOthinfilmsWaspreparedbyPLD．Bychanging02pressuresandthecontentofNiinthefilms，wesoughtforpropergrowthconditionsforNidop

7、edZnOthinfilmsandstudiedtheaffectstothemagneticproperties．Optimalconditionsareasfollows：thesubstratetempretureis500。C，the02pressureis0．02Pa,andtheconcentrationofNiisabout3at．％．WhentheNiconcentrationisabove5at．％．theexistenceofNiOphaseinthefilmsinduceselectricpropert

8、iesdeterioratedandthevisiblelighttransmittance(400—800nm)decreasedsharplyresultingfromthebindingenergyrelaxation．NtypeZn(Ni，Ga)OthinfilmsandPtype