過渡金屬摻雜ZnO納米材料的合成與光學性能研究.pdf

1、天津理工大學碩士學位論文過渡金屬摻雜ZnO納米材料的合成與光學性能研究姓名：李美惠申請學位級別：碩士專業(yè)：微電子學與固體電子學指導教師：陳希明；徐建萍201202AbstractZnOnanostructurewithadirectwidebandgapandalargeexcitonbindingenergyisconsideredtobeoneofthemostimportantsemiconductormaterialsforap

2、plicationsinoptoelectronicsItistheidealbasetobuildphotoelectronicdevicesIntentionalintroductionofimpuritiesintoasemiconductorisaneffectiveapproachtocontrolitsenergylevelsandphysicalpropertiesInthispapertransitionmetaldop

3、edZnOnanostructuresweresynthesizedviadifferentroutes，severalcharacterizationmethodswereadoptedtostudytheirstructuralandopticalpropertiesThemajorresultsarelistedasfollows：1Znl—xCox0nanocrystalsweresynthesizedthroughasimpl

4、esolutionroutefollowedbyacalciningprocessTheanalysisofXRDandRamanspectrarevealsthatasmallquantityofCoionswereincorporatedintoZnOlaRicestructure，whereasthesecondaryphaseofC0304wassegregatedathighCodopingconcentrations，the

5、solidsolubilityofCoionsinZnOnanocrystalscouldbelowerthanO05Threeadditionalabsorptionpeaksareobservedat566nln，609nnland654nnlforCodopedZnOnanocrystals，whicharerelatedtoddtransitionsofC02inatetrahedralcrystalfieldandCanbea

6、ttributedtothe4A2(F)2E(G)，4A2(F)4Tl(P)，and4A2(F)4AI(G)，respectivelyTheemissionpeakscenteredat685nlnwereobservedinPLspectraindicatingthattheincorporationofCopintroducedimpuritylevelsintoZnO2Znl—x(hOnanostructuresweresynth

7、esizedviasolvothermalrouteTheeffectsofdopingconcentrationandreactiontemperatureonthestructural，morphologicalandopticalpropertiesofZnOWereinvestigatedSegregationofCuOphaseWasobservedinRamanspectraathighdopingconcentration

8、sTheabsorptionspeatraofCudopedZnOshowsbroadabsorptionpeakinvisibleregionThePLspeatraofallsamplesdisplaytwoemissionpeaks，whichincludeanearband—edgeemissionandadefectemissionBlueshiflsofthesetwopeaksWeleobservedafterCudopi

9、ngwhichmayberelatedtochangesinlaaicestressandCudopingrespectivelyForsampleswiththesamedopingconcentration，thehigherreactiontemperaturehelpedtoimprovethecrystalqualityCuOrelatedphaseWassegregatedwhenthetemperatureWaShighe

10、rthan120oCTheonlymajordifferenceinthePLspectraofdopedsamplesobtainedindifferenttemperatureisthepeakintensityItmayberelatedtosegregationofCuinZnO3ZnlxCuO／ZnOcore／shellnanoerystalsweresynthesizedbywaterbathmethodThesubsequ

11、entadditionsofZn2andOH’precursorsformZnOshelloutsideZnO：Cucore111esegregationofCuOphaseisdetectedinRamanspeatraofthedopedsamplewithoutZnOshellItissuggestedthatsomeCuatomscanbesegregatedfromZnOnanocrystalsandtheseparatedC