Lecture 6 - Carrier Drift and Diffusion

Lecture 6 - Carrier Drift and Diffusion - Introduction to...

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1 Introduction to Semiconductor Devices Instructor : Ridha Kamoua Stony Brook University Carrier Transport: Drift and diffusion
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2 All federal and state copyright interests are reserved for all original material presented in this course through any medium, including lecture, electronic transmission or print. Individuals may not sell, be paid or receive anything of value for class notes made during this course from any person or entity without the express written permission of (author). In addition to legal sanctions, violation of these copyright prohibitions may result in University disciplinary action The Teach Act: Fair Use and Copyright Protection for Digital Media
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3 Learning Outcomes: 1. Describe the mechanism of drift and diffusion 2. Carrier mobility and its temperature dependence 3. Relationship between mobility and diffusion coefficient 4. Plot the potential and electric field using energy band diagram
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4 I = (qnv n + qpv p ) A Carrier Transport (process by which carriers move) we have discussed how to determine carrier densities n and p in terms of doping. To determine the current, we need to have an expression for the carrier velocities: v n and v p Carrier velocity corresponds to carrier movement. 2 basic transport mechanisms: Drift due to electric field Diffusion due to gradient in carrier densities
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This note was uploaded on 10/03/2010 for the course ESE 231 taught by Professor Kamoua,r during the Spring '08 term at SUNY Stony Brook.

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Lecture 6 - Carrier Drift and Diffusion - Introduction to...

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