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Q.

In case of a semi conductor, which one of the following statements is wrong ?

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a

Temperature coefficient of resistance is negative

b

Resistivity is in between that of a conductor and insulator

c

At absolute zero it behaves as a conductor

d

Doping increases conductivity

answer is D.

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Detailed Solution

Resistance of a semiconductor decreases and conductivity increases with increase in temperature due to the transfer of electrons from valence band to conduction band. 

Therefore at absolute zero, a semiconductor behaves as an insulator.

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In case of a semi conductor, which one of the following statements is wrong ?