Lecture 8 ESE 521.pdf - Lecture 8 Deviations from the Ideal Diode Online Text Applets http\/ecee.colorado.edu\/~bart\/boo k\/welcome.htm

Lecture 8 ESE 521.pdf - Lecture 8 Deviations from the Ideal...

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Lecture 8: Deviations from the Ideal Diode Online Text: bart/boo k/welcome.htm m Applets: http:// Recommended Text: “The PN Junction Diode,” Vol 2 Neudeck CHAPTER 4
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Deviations from the Ideal Diode in Reverse Bias I V reverse bias forward bias
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Deviations from the Ideal Diode in Reverse Bias I V real ideal V BR Origins: 1. Generation and recombination in the depletion region W 2. Junction breakdown 3. Tunneling or Zener Breakdown 4. Avalanche Multiplication
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Generation and Recombination in W in reverse bias, generation in the depletion region dominates over recombination as Remember: and qV<0 2 i n pn < = = kT qV n kT F F n np A i p n i exp exp 2 2 E i E C E V F n F p generation in the depletion region ehps generated in W drift down the potential hill → thermally generated carriers contribute to I in the same direction to add to -I o o i A o o i G R p n o o i x x G R W qAn kT qV I I W qAn I n G Gdx qA I n p τ τ τ τ τ τ 2 1 exp 2 2 2 ~ = = + = = and where
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