lecture5annotat - 6.012- MicroelectronicDevicesandCircuits-

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Unformatted text preview: 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture5-1Lecture5- PNJunctionandMOSElectrostatics(II)pnJunctioninThermalEquilibriumSeptember22,2005Contents:1.Introductiontopnjunction2.Electrostaticsofpnjunctioninthermalequilibrium3.Thedepletionapproximation4.ContactpotentialsReadingassignment:HoweandSodini,Ch.3,3.3-3.46.012- MicroelectronicDevicesandCircuits- Fall2005Lecture5-2KeyquestionsWhathappensifthedopingdistributioninasemi-conductorabruptlychangesfromn-typetop-type?Isthereasimpledescriptionoftheelectrostaticsofapnjunction?6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture5-31.Introductiontopnjunctionpnjunction:p-regionandn-regioninintimatecontactWhyisthep-njunctionworthstudying?Itispresentinvirtuallyeverysemiconductordevice!Example:CMOScrosssectionPMOS NMOS p n p+ n+ n+p+ p+ n+ n Understandingp-njunctionisessentialtounderstandingtransistoroperation.6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture5-42.Electrostaticsofp-njunctioninequilibriumFocusonintrinsicregion:p n metal contact to n side metal contact to p side(Na) (Nd) x =0 n type p type p type x x (a) (b) Dopingdistributionofabruptp-njunction:N Nd x0 Na p-region n-region drift balances6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture5-5Whatisthecarrierconcentrationdistributioninthermalequilibrium?Firstthinkoftwosidesseparately:p-region n-region log po, no po po no no Nd ni2 Nd Na ni2 x Nowbringthemtogether.Whathappens?DiffusionofelectronsandholesfrommajoritycarriersidetominoritycarriersideuntilNa minority carrier minority carrier majority carrier majority carrier diffusion.driftbalancesdiffusion.al reace-charre6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture5-6Resultingcarrierprofileinthermal...
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This note was uploaded on 07/20/2009 for the course ELECTRICAL 6.012 taught by Professor Prof.jesúsdelalamo during the Fall '05 term at MIT.

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lecture5annotat - 6.012- MicroelectronicDevicesandCircuits-

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