EE 436 Physics of Transistors G. Tuttle

Drift current practice problems
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A piece of silicon is n-type with a uniform donor doping concentration of ND = 9.0e+17 cm-3.
The electron mobility is μn = 252 cm2/Vs.

What are the conductivity and resistivity of this silicon?

A resistor with resistance R = 200 Ω will be made using this silicon.
The resistor's cross-sectional dimension are W = 5 μm and t = 2 μm.
How long should the resistor be?

Answer