week04 - ECE 3150 Spring 2009 Week 4 Recitation Ask for...

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ECE 3150 Spring 2009 Week 4 Recitation Ask for Homework questions first on Homework 3 (you can choose to do Work problems below first) Review qualitatively what equations/models can describe the electrostatics and IV characteristics. They probably need to hear them a second time from a different point of view for the concepts to sink in. Additional Work problems: 1. (Repeat from last week, in case you did not finish. Do finish (g) to (k)) For a p-n junction below, assuming - x p and x n denote the edges of the depletion region. Notice that N D is constant throughout the region, which is equivalent to a higher p-type doping going into a homogeneous n-type material. (a) At equilibrium, in which region the charge neutrality is true? (b) At equilibrium, in which region does np = n i 2 hold? (c) At equilibrium, calculate the built-in potential in volts. (d) At equilibrium, in region 2, is the acceptor ionized ( N A becomes N A - )? Is the donor ionized? (e) At equilibrium, what are the signs (or zero) of
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This note was uploaded on 08/30/2009 for the course ECE 3150 taught by Professor Spencer during the Spring '07 term at Cornell University (Engineering School).

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week04 - ECE 3150 Spring 2009 Week 4 Recitation Ask for...

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