ECE 3040
Dr. Alan Doolittle
Microelectronic Circuits
Homework #3
NOTE: Some reference materials including tables, figures etc.
.. handed out in class or in your
text may be needed to solve these problems.
1.) Pierret 3.2 parts “c” and “d”.
2.)
Pierret 3.6
3.)
Pierret 3.13
4.)
A 2 ohmcm ptype silicon bar with an electron mobility of 1000 cm
2
/VSec and hole
mobility of 250 cm
2
/VSec is to be used as a photoconductor (a device that has it’s resistivity
change with illumination).
The bar is 10 cm long and has a cross sectional area of 0.1 cm
2
.
A.)
What is the resistance of the bar?
B.)
What is the electron and hole concentrations in the bar?
C.)
If light generates 10
16
cm
3
electrons in steady state, assuming no change in mobility,
what is the new resistance of the bar?
D.)
It is desired to have a SIMPLE circuit that will read the change in resistance.
You
only have at your disposal a 9 volt battery, another 4 ohm resistor, wire and a voltmeter.
Design such a circuit.
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 Spring '07
 HAMBLEN
 Dr. Alan Doolittle, Electron mobility, hole mobility, Alan Doolittle Microelectronic, ptype silicon bar

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