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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 Spring '10
 ZORMAN
 Electron, Electric charge, Fundamental physics concepts

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