四针状氧化锌晶须的场发射特性研究

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1、西南交通大学硕士学位论文四针状氧化锌晶须的场发射特性研究姓名：李艳霞申请学位级别：硕士专业：材料学指导教师：周祚万20070601西南交通大学硕士研究生学位论文第

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3、页ABSTRACTZincoxideshavebeenwidelyusedinsophisticatedceramics，piezoelectricandphotoelectricproducts，catalystsfortheircomprehensiveandpeculiarbehaviorssuchassemiconductingproperty,photoluminescenceandchemicalsta

4、bility．Recently，ZnOhasbecomeoneofthemostpromisingcathodematerialsforfieldemission．Thefieldemissionpropertiesoftetra—needlelikezincoxidewhiskers(T．ZnOw)werestudiedinthisdissertation。Foritstetra-needlelikestructure，theproductiveT—ZnOwshowedarelativelowturn-onfieldof3．7V／#mandthresholdfieldof6．

5、9V／／zm。andthefieldenhancementfactor卢valueWas2315．TheAI—dopedT—ZnOwsampleswerepreparedbysolidsolmiontreatmentwithdifferentloadingsofAI”．SEMimagesandX-raydiffractionpatternsindicatedthatthedopantofA1’+didn’tchangethetetra-needlelikemorphologyandwurtzitestructureofT-ZnOw．A13+substitutedZn2+inZn

6、OcrystalandthelatticeconstantdecreasedwiththeincreasingofloadedA1”．Photoluminescencespectraindicatedthat0．5m01％Al”一dopedT—ZnOwshowedthebestcrystalqualityandthedopantofAP+changedthecarrierconcentration，whichwereconfn'medbyRanlanspectra．Ultraviolet—visiblespectroscopiesindicatedthatAP+dopingma

7、detheabsorptionedgeblue·shiftandbroadenedthebandingenergyofT—ZnOw．T—ZnOwfilmswerefabricatedusingscreen-printingtechnique．ItwasfoundthatthefieldemissionpropertiesofT-ZnOwwereimprovedbyheattreatmentandthetum-onfieldandthresholdfieldwere2．6V／I．tmand5．2V／gin，respectively，whilethefieldenhancement

8、factor芦1l，aluewas4129．Furthermore，thefieldemissionpropertiesofToZnOwweregreatlyimprovedby也eAP+doping．ForthesamplesofO．5m01％A13+-dopedT-ZnOw，thevaluesofturn-onfield，thresholdfield，声andemissiondotsdensitywere西南交通大学硕士研究生学位论文第lll页0．74V／ixm，2．6V／I_tm，30249，and103／cm2，respectively,andtheemissioncu

9、rrentwasnodegradationin8h，whichdemonstratedthatA1”。dopedtetra‘needlelikeZnOwhiskersmighthavepotentialapplicationinthefieldofvacuumelectrondevices．KeyWords：Tetra-needlelikezincoxide；doping；photoluminesccnce；fieldemission西南交通大学硕士研究生学位论文第1页第一章前言显示技术是利