吴伟立 214_215_c5

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1、CHAPTER5ThepnJunctionandMetal-SemiconductorContactB.Describehowthebuilt-inpotentialbarriermaintainsthermalequilibrium.3.A.Sketchtheenergy-banddiagramofthepnjunctionwhenareverse-biasvoltageisapplied.B.Describewhathappenstothespacechargewidthsandelectricfieldwhenareverse-biasvoltageisap

2、pliedtothepnjunction.C.Explainthesourceofjunctioncapacitance.D.Describethecharacteristicsandpropertiesofaone-sidedpnjunction.4.A.DescribetheformationofaSchottkybarrierjunctioninwhichΦm＞Φs.anddefinetheSchottkybarrierjunctionandbuilt-inpotentialbarrier.B.Sketchtheenergy-banddiagramofare

3、verse-biasedSchottkybarrierjunction.5.A.Sketchtheenergy-banddiagramofaforward-biasedpnjunctionandaforwardbiasedSchottkybarrierjunction.B.Sketchthecurrent-voltagecharacteristicsofapnjunctiondiodeandaSchottkybarrierjunctiondiodeonthesameplot.Describesimilaritiesanddifferences.6.A.Sketch

4、theenergy-banddiagramofanidealnonrectifyingcontactwithbothn-typeandp-typesemiconductors.B.Sketchtheenergy-banddiagramofatunnelingohmiccontact7.A.DescribehowalinearlygradedjunctionisformedB.Defineahyperabruptjunction.8.Describethegeneralprocedureoffabricatingapnjunction.REVIEWQUESTIONS

5、1.Sketchtheenergy-banddiagramofazero-biasedpnJunction.2.A.Whyistheelectricfieldalinearfunctionofdistanceinauniformlydopedpnjunction?Whatisthedirectionoftheelectricfield?B.IfNa>Ndinapnjunction,isXp>Xn,Xn>Xp,orXn=Xp?C.Howdoesthebuilt-inpotentialbarrierdependonthedopingconcentrationsinth

6、epnjunction?3.A.Inareverse-biasedpnjunction,whichsidehasthehigherpotential?B.Sketchtheenergy-banddiagramofareverse-biasedpnjunction.C.Whydoesthespacechargewidthincreasewithreverse-biasvoltage?D.Whydoesacapacitanceexistinareverse-biasedpnjunction?Whydoesthecapacitancedecreasewithincrea

7、singreverse-biasvoltage?E.Whatisaone-sidedpnjunction?Whatparameterscanbedeterminedinaone-sidedjunction?4.Sketchtheenergy-banddiagramofazero-biasedrectifyingmetal-to-n-typesemiconductorcontact.DefinetheSchottkybarrierandbuilt-inpotentialbarrier.5.A.Sketchtheenergy-banddiagramofaforward

8、-bias