Chapter 4 Lecture - Part 2

An arbitrary electron concentration gradient in one

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Unformatted text preview: e of electrons by diffusion. An arbitrary electron concentration gradient in one dimension (a) division of n(x) into segments of length equal to a mean free path for the electrons; (b) expanded view of two of the segments centered at x0. Diffusion of Carriers Diffusion • Diffusion Currents – Usually we think of charge flow (current) as a result Usually of an applied external field of – Current can also flow as a result of a gradient in Current charge distribution charge • This is known as a diffusion current • Expressed in terms of the carrier concentration gradient • Diffusion and Drift Currents – Applicable when there is an external f...
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This note was uploaded on 04/02/2014 for the course EECS 321 taught by Professor Zorman during the Spring '10 term at Case Western.

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