The dopant to be added to make silicon an $n$ -type of semiconductor is

Boron

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Antimony

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Indium

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Gallium

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Solution

The correct option is B Antimony
The $n$ -type impurity loses its extra valence electron easily when added to a semiconductor material, and in doing so, increases the conductivity of the material by contributing a free electron. This type of impurity has $5$ valence electrons and is called a pentavalent impurity. Antimony is such a pentavalent impurity.

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How many valence electrons are required in impurity, to be added to silicon, to get an an n-type semiconductor?

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