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Lecture11

Lecture11 - Photoconductive Device Photoconductive$ = q(n0...

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EE 332 Spring 2013 Photoconductive Device σ = q n 0 + Δ n ( ) μ n + p 0 + Δ p ( ) p ! " # $ Δ = q Δ n n + Δ p p ( ) Δ = q G Light τ n n + G Light p p ( )
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EE 332 Semiconductor Materials and Devices Lecture 11. Diffusion of Carriers 1. Diffusion process 2. Diffusion and drift of carriers
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EE 332 Spring 2013 Diffusion Particles diffuse from regions of higher concentration to regions of lower concentration region, due to random thermal motion.
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EE 332 Spring 2013 Diffusion of Electrons and Holes Nature attempts to reduce concentration gradients to zero. Example: a drop of ink in a cup of water 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.
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EE 332 Spring 2013 Diffusion of a Pulse of Electrons
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EE 332 Spring 2013 Electron Concentration Gradient
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EE 332 Spring 2013 Fick’s Law Diffusion as flux, F, (of particles in our case) is proportional to the gradient in concentration For electrons and holes, the diffusion current density (flus of particles times ± q )
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Lecture11 - Photoconductive Device Photoconductive$ = q(n0...

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