Q180 / 180 · COMEDK 2017 · Physics

Identify the property which is not characteristic for a semi-conductor.

Correct answer
A
At a very low temperatures it behaves like an insulator.
B
At higher temperatures two types of charge carriers will cauise conductivity.
C
The charge carriers are electrons and holes in the valance band at higher temperatures.
D
The semiconductor is electrically neutral.

Solution

A semiconductor acts like an insulator only at absolute temperature i.e. $0^{\circ} \mathrm{K}$. It is because the free electrons in the valence band of semiconductor will not carry enough thermal energy to overcome the forbidden energy gap at absolute zero. Hence, option (a) is not correct.

Hence, the correct answer is option: 'A'.

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