2_1_class slides 13 - density can be expressed as • p = p...

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EE 2 Fall 2007 Class 13 slides
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Outline Summary of SRH model of recombination and generation Continuity equation Simple examples of use of continuity equation Abrupt p-n junction Electrostatic potential
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Summary of SRH model
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Shockley Read Hall model (SRH) Excess carriers As an example, consider an n-type semiconductor. Let us assume that excess minority carriers of density p are created by any one of the three processes we saw in the last slide and the minority carrier (hole)
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Unformatted text preview: density can be expressed as • p = p no + ∆ p • Excess majority carriers are either produced in the generation process itself or they flow into the region where the minority carriers are present such that the excess majority carrier density ∆ n is equal to ∆ p . • The net recombination rate U is equal to the difference between the recombination rate R and the generation rate G . U = R - G Continuity Equation...
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