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"A semiconductor is a substance which has resistivity (10−4 to 0.5 Ωm) in between conductors
and insulators e.g. germanium, silicon, selenium, carbon etc."
Semiconductors are used to manage and control the flow of current in any electrical devices & equipments.

Properties of Semiconductors

(i) The resistivity of a semiconductor is less than an insulator but more than a conductor.

(ii) Semiconductors have negative temperature co-efficient of resistance i.e. the resistance
of a semiconductor decreases with the increase in temperature and vice-versa. For example, germanium is actually an insulator at low temperatures but it becomes a good conductor at high temperatures.

(iii) When a suitable metallic impurity (e.g. arsenic, gallium etc.) is added to a semiconductor, its
current conducting properties change appreciably.

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