Lecture 11 - Minority Carrier Diffusion Equations and Quasi Fermi Levels

Lecture 11 - Minority Carrier Diffusion Equations and Quasi Fermi Levels

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1 Minority Carrier Diffusion Equations • Objective: Be able to calculate carrier concentrations and currents in semiconductor devices. • Questions to be Answered: – What are the critical equations governing semiconductor device behavior? EE360 – Lecture 11 – How do we solve these equations? Review: Minority Carrier Diffusion Equations Minority Carrier Diffusion Equations (subscripts to remind us that we are working with minority carriers only) Diffusion Thermal RG Photogeneration EE360 – Lecture 11
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2 Simplifying the MCDEs • When asked to solve MCDEs, always examine the problem for simplifications: EE360 – Lecture 11 Special-Case Solutions to the Minority Carrier Diffusion Equations EE360 – Lecture 11 L N and L P are the minority carrier diffusion lengths. We often piece together solutions for different parts of a device. From Pierret’s Semiconductor Device Fundamentals page 125
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3 One extra solution • Given: uniform illumination only no concentration gradient • Simplified Diff. Eqn.:
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This note was uploaded on 04/20/2008 for the course EE 360 taught by Professor Hastings during the Spring '08 term at Kentucky.

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Lecture 11 - Minority Carrier Diffusion Equations and Quasi Fermi Levels

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