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 ntype when Si atoms replace Ga atoms? Explain.
(d) Is the GaAs doped p or ntype 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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 Spring '08
 Staff
 Electron, Bonding Model, Fermi level, Si atoms

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