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1、SemiconductorPhysics[60ptstotal,6ptseach]1,Giveoutthreeexamplesofzincblendestructuresemiconductormaterials.2,Pleasewritedowntherelationbetweeneffiectivemassand.3,Pleasedescribetheroleofphononsinthetransitonofindirectbandgapmaterials.4,Whatisadonorlevel(describewithcharacter
2、sandfigure)?Whatelementscanbeasdonorimpuritiesfor.5,PleasewritedowntheFermidistributionfunctionandindicatetheapplicablecase.6,At,PleasedescribethephysicalmeaningofFermidistributionfunction.7,Pleasetellustherearehowmanykindsofrecombinations.Whatarethey?Andpleasefigurethemout
3、.8,PleasefigureouttheI-Vcurveofthetunnelingdiodeandanalyzeitindetail.9,Pleasedrawasketchofametalandasemiconductorbeforecontact.Workfunction,electronaffinity,etc.Shouldbeindicatedinthefigure.10,PleasedrawthebandgapofanOhmiccontactwhichformedbymetal-ntypesemiconductor.[40ptst
4、otal,10ptseach]1,Assumingaisthelatticeconstantofonedimentionalcrystal.Thebootomoftheconductionbandandtopofthevallancebandare,respectively.Whereisthemassofelectrons,,.Pleasecalculate(1)thebandgap(2)effectivemassofelectronsatthebottomoftheconductionband(3)effectivemassofelect
5、ronsatthetopofthevalanceband(4)thequasi-momentumwhenelectronstransitfromthetopofbalancebandbottomofconductionband.2,ThebandgapofGaP,dielectricconstantis,theeffectivemassofholes.Pleasecalculate(1)theionizingenergyofacceptorimpurities(2)orbitradiusoftheholegroundstateboundedb
6、yacceptorimpurities3,Forann-type,.becauseofillumination.Pleasecalculatetheconductivitiesofdarkandillumination.4,Let,.PleasecalculateoftheabruptGep-njunctionatroomtemperature.
