week03 - ECE 3150 Spring 2009 Week 3 Recitation Ask for...

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ECE 3150 Spring 2009 Week 3 Recitation Ask for Homework questions first on Homework 2 (you can choose to do Work problems below first) Additional Work problems: 1. For a piece of semiconductor under equilibrium at room temperature which contains N A =10 17 cm -3 and N D =10 15 cm -3 , what is the best estimate for the electron concentration, assuming n i = 10 10 cm -3 and complete ionization of dopants? (Teach ways to estimate without using a calculator) (a) 10 3 cm -3 (b) 10 10 cm -3 (c) 10 15 cm -3 (d) 9.9 × 10 16 cm -3 (e) 10 17 cm -3 2. Same semiconductor from Question 2, what is the hole concentration? (a) 10 3 cm -3 (b) 10 10 cm -3 (c) 10 15 cm -3 (d) 9.9 × 10 16 cm -3 (e) 10 18 cm -3 3. Same semiconductor as Prob. 2. If we apply an electric field, what will be the species that will contribute most to the electric current? (a) Electrons n (b) Holes p (c) Donor dopant N D (d) Acceptor dopant N A (e) All of the above 4. Same from Prob. 2, what is the electrostatic potential at equilibrium? Is it negative or
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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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week03 - ECE 3150 Spring 2009 Week 3 Recitation Ask for...

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