Lecture10-EquationsStateMinorityCarrierDiffusion

# Lecture10-EquationsStateMinorityCarrierDiffusion - Lecture...

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ECE 3040 - Dr. Alan Doolittle Georgia Tech Lecture 10 Equations of State, Minority Carrier Diffusion Equation and Quasi-Fermi Levels Reading: Pierret 3.4

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ECE 3040 - Dr. Alan Doolittle Georgia Tech Drift Current in Diffusion Current in n, p due to Thermal R-G, Direct recombination light and other processes Ways carrier concentrations can be altered Continuity Equations ... , Re ... , Re etc light as such processes other All Generation n combinatio Diffusion Drift etc light as such processes other All Generation n combinatio Diffusion Drift t p t p t p t p t p t n t n t n t n t n + + + = + + + = There must be spatial and time continuity in the carrier concentrations Drift Current out Diffusion Current out
ECE 3040 - Dr. Alan Doolittle Georgia Tech Ways carrier concentrations can be altered Continuity Equations P Pz Py Px Diffusion Drift N Nz Ny Nx Diffusion Drift J q z J y J x J q t p t p J q z J y J x J q t n t n = + + = + = + + = + 1 1 1 1 Divergence in the current ... , Re ... , Re 1 1 etc light as such processes other All Generation n combinatio P etc light as such processes other All Generation n combinatio N t p t p J q t p t n t n J q t n + + = + + =

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ECE 3040 - Dr. Alan Doolittle Georgia Tech Continuity Equations: Special Case known as “Minority Carrier Diffusion Equation” Simplifying Assumptions: 1) One dimensional case. We will use “x”.
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## This note was uploaded on 08/23/2011 for the course ECE 3040 taught by Professor Doolittle during the Spring '11 term at University of Florida.

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Lecture10-EquationsStateMinorityCarrierDiffusion - Lecture...

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