The drift velocity is the flow velocity that aparticle such as an electron attains due to an electric field Itcan also be referred to as axial drift velocity In general anelectron will propagate randomly in a conductor at the Fermivelocity An applied electric field will give this random motion asmall net flow velocity in one directionIn a semiconductor the two main carrier scattering mechanismsare ionized impurity scattering and lattice scatteringBecause current is proportional to drift velocity which in aresistive material is in turn proportional to the magnitude of anexternal
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