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ECE474S09_Lecture22

# ECE474S09_Lecture22 - 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 22: Chp. 03: Current State-of-Art Transistors Use n and p to get current I : I = q( n μ + p μ ) E , E = electric field (V/cm), μ = mobility (cm cm )
I = q(n 0 <velocity electron >+ p 0 <velocity hole >) Area I = q(n 0 μ n + p 0 μ p ) E Area J = I/Area = q(n 0 μ n + p 0 μ p ) E = σ E Lecture 21:

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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 0 μ n + p 0 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 0 μ n + p 0 μ p ) E Area New: F = q E + -

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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 0 μ n + p 0 μ p ) E Area New: F = q E F x = q E x + - +z +y +x
Magnetic field B + battery: what happens?

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