hw2_f10 - ECE 440 Homework 2 Due: Friday class, September...

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Homework 2 Fall 2010 Due: Friday class, September 10, 2010 Print your name and netid legibly. Show all work leading to your answer clearly and neatly. Staple multiple pages. Put all units. 1. The bonding model for GaAs is pictured below. (a) Draw the bonding model for GaAs depicting the removal of the shaded Ga and As atoms. (b) Redraw the bonding model for GaAs showing the insertion of Si atoms into the missing Ga and As atom sites. (c) Is the GaAs doped p- or n-type when Si atoms replace Ga atoms? Explain. (d) Is the GaAs doped p- or n-type when Si atoms replace As atoms? Explain. (e) Draw the energy band diagram for GaAs when the GaAs is doped with Si on (i) Ga sites and (ii) on As sites. 2. (a) Under equilibrium conditions and T>0K, what is the probability of an electron state being occupied if it is located at the Fermi level? (b) If E F is positioned at E C , determine (numerical answer required) the probability of finding electrons in states at E C -kT. (c) The probability a state is filled at E
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This note was uploaded on 09/09/2010 for the course ECE 440 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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hw2_f10 - ECE 440 Homework 2 Due: Friday class, September...

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