准一维纳米结构宽带隙半导体的场致过热电子发射模型分析

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1、StudyofFieldInducedHot—electronEmissionModelinQuasiOne—dimensionalNanostructuresofWideBandGapSemiconductorsMajor：Name：CondensedMatterPhysicsZengJiaZhongSupervisor：XuNingSheng，SheJunCongABSTRACTInrecentyears，manyexperimentalstudiesarereportedonfieldelectronemissionfroms

2、emiconductornanostructures，buttherelatedtheoreticalstudyislackingbehind．Thus，anumberofimportantexperimentalobservationsarenotphysicallyexplained；theseincludenonlinearplotsOnFNcoordinates，extremelylargefieldenhancementfactorsdeterminedbyfittingbasedFNtheory，andthermo．se

3、nsitiveoffieldemissioncurves．BecausetheexternalfieldcanpenetrateintosemiconductorandchangethebandstructureandtheenergyofelectronsundersurfacetheelectronemissionwillbeaffectedandtheIVrelationwillbecomemorecomplicated．Thefieldinducedhotelectronemissionmodel(LBXmodel)，whi

4、chisestablishedbyR．V．Latham，K．H．BaylissandN．S．Xu,haveconsideredthe‘'heatingeffect'’andbandbendingasresultsofpenetrationfieldintoinsulatorlayerandintroducedtheexpressionof“effectivetemperature”andthethermalemissionformulaintothefieldemissionI—Vcharacteristic．Inthiswork,

5、theLBXmodelisadaptedanddevelopedtotheexplanationoffieldemissionfromquasione-dimensionalwidebandgapsemiconductor(WBOS)．Ourresearchisinconnection、析tlltheaboveexperimentalphenomena．Agroupofresearchisdonebasedfieldinducedhot—electronemissionmodelinVIⅡthiswork：(1)．Theelectr

6、ontransportprocessinWBGSnanowiresandtheformationofhotelectronsundersurfaceisdescribedbythebanddiagram、析t11theconsiderationofbandbendingandhoppingelectroncurrentamongsurfacestates．(2)．TheLBXmodelisappliedtotheexplanationoffieldemissionfromWBGSnanostructure．Therelationso

7、fj—F，I-VandpS(FNslope)aregivenbyintroducedtheeffectivetemperatureandthermalemissionformulaintocalculation．(3)．IntroducingtheeffectivetemperatureintothermalemissionformulaandMurphy-GoodintegralequationrespectivelyandusingZnOasaexampleforcalculation,wegetthelinearrangeof

8、fieldemissiononFNcoordinatesatlowfieldandnonlinearrangeathighfieldregion．Therangethatthethermalemissionformulacallbes