ECE474S09_Lecture22

# ECE474S09_Lecture22 - ECE 474 Principles of Electronic...

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Unformatted text preview: ECE 474: Principles of Electronic Devices Prof. Virginia Ayres Electrical & Computer Engineering Michigan State University [email protected] Lecture 22: 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 majority carrier concentration: n OR p I = q(n <velocity electron >+ p <velocity hole >) Area I = q(n μ n + p μ p ) E Area J = I/Area = q(n μ n + p μ p ) E = σ E Lecture 21: Battery only: what happens? V = IR, R= ρ L /wt Hole motion, electron motion what you’d expect from the +- terminals of the battery I = q(n μ n + p μ p ) E Area + - Battery only: what happens? V = IR, R= ρ L /wt Hole motion, electron motion what you’d expect from the +- terminals of the battery I = q(n μ n + p μ p ) E Area New: F = q E + - Battery only: what happens?...
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ECE474S09_Lecture22 - ECE 474 Principles of Electronic...

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