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ECE474S09_Lecture21 - ECE 474 Principles of Electronic...

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ECE 474: Principles of Electronic Devices Prof. Virginia Ayres Electrical & Computer Engineering Michigan State University [email protected]
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Lecture 21: Chp. 03: Current State-of-Art Transistors Use n and p to get current I drift : I drift = q( n μ n + p μ h )E, E = electric field (V/cm), μ = mobility (cm cm ) s V Use Hall effect to experimentally get n 0 /p 0
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Put a potential difference/external field across a doped semiconductor to get a current going: V = I R I = (1/R) V = G V, G = conductance V in terms of Volts J = σ E, E = electric field (V/cm) σ = conductivity σ = 1/ ρ ρ = resistivity, related to resistance R = ρ L wt
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Consider current I in Amps. Can connect this to the electron n0 and hole p0 concentrations: I = charge/time = C/sec = Amp = q (concentration) (velocity) Area
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Consider current I in Amps. Can connect this to the electron n0 and hole p0 concentrations: I = charge/time = C/sec = Amp = q (concentration) (velocity) Area I = q(n 0 velocity electron + p 0 velocity hole ) Area What are these velocity values?!
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Consider current I in Amps. Can connect this to the
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