Why does a semiconductor's resistivity fall on heating?
ACarrier density n rises a lot
BCollision time grows longer
CElectron mass gets smaller
DDrift speed stops depending on E
Answer & Solution
Correct answer: A. Carrier density n rises a lot
In a semiconductor the number of free carriers per unit volume grows with temperature, and this increase more than compensates the shorter collision time in rho = m/(n e^2 tau).
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