Lecture 8 - Band Bending-Diffusion

Lecture 8 - Band Bending-Diffusion - Diffusion and Band...

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1 Diffusion and Band Bending • Objective: Be able to calculate carrier concentrations and currents in semiconductor devices devices. • Questions to be Answered: – How does diffusion describe carrier motion? – How do we draw band diagrams in the presence of an electric field? EE360 – Lecture 8 – How do we relate the diffusion coefficient to the mobility? – How are carriers generated, and how do they recombine? What is diffusion and why does it occur? Diffusion: the process by which particles spread from areas of high concentration to low concentration due to thermal motion (need not concentration due to thermal motion (need not be charged particles) EE360 – Lecture 8 high concentration low concentration Over time the system tends toward a uniform distribution Pierret (Advanced Semi. Fundamentals) pg. 196
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2 Java Applet for drift, diffusion, and recombination-generation: http://jas.eng.buffalo.edu/education/semicon/diffusion/diffusion.html EE360 – Lecture 8 Diffusion Current • Carrier concentration gradients
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Lecture 8 - Band Bending-Diffusion - Diffusion and Band...

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