8.NP_diode - 1 Carrier concentrations and potential What is...

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1 Carrier concentrations and potential Carrier concentrations and potential What is a typical value for this?
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2 The potential profile The potential profile Use Poisson's Equation: Results for an abrupt-junction np-diode N D =1E18/cc N A =1E17/cc
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3 The Depletion Approximation The Depletion Approximation • Approximate the SPACE-CHARGE LAYER boundaries • Approximate the carrier concentrations within the SCR • Split the non-linear DE into two, linear ODE's • Impose BC's • Solution is
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4 How good is the DA? How good is the DA? Results for an np-diode N D =1E18/cc N A =1E17/cc Overall charge neutrality Values for x dn and x dp ? Depletion approximation for the SCR width Value for W ?
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5 np np - - junction under bias junction under bias Can we assume that (-x dn ) (x dp )= ? -x N -x dn x dp x P V a
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6 Forward Forward - - bias current bias current • Net current is a diffusive current • Why has W shrunk?
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7 The The np np - - diode diode Sections 6.3, 6.4, 6.5, 6.6 of course text: 1. Quasi-neutrality 2. Quasi_Fermi levels 3. Shockley's Law of the Junction 4. Ideal-diode J-V characteristic
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This note was uploaded on 11/10/2010 for the course EECE 480 taught by Professor David during the Fall '09 term at The University of British Columbia.

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8.NP_diode - 1 Carrier concentrations and potential What is...

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