Lecture11

Example a drop of ink in a cup of water f higher

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Unformatted text preview: ow of carriers” from one zero. Example: a drop of ink in a cup of water f higher concentration to lower concentration results in a iffusion current”. In semiconductors, this “flow of carriers” from one region of higher concentration to lower concentration results in a “Diffusion Current”. Visualization of electron and hole diffusion on a macroscopic scale. EE 332 Spring 2013 ECE 3080 - Dr. Alan Diffusion of a Pulse of Electrons EE 332 Spring 2013 Electron Concentration Gradient EE 332 Spring 2013 Fick’s Law •  Fick’s Lawin our case) is Fick’s Law Diffusion as flux, F, (of particles proportional to the gradient in concentration •  For electrons and holes, the diffusion current density (flus of particles times ±q) EE 332 Spring 2013 Diffusion Current Diffusion Current JN ,diff dn = qDN dx JP ,diff dp =...
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This document was uploaded on 02/18/2014.

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