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(A) To obtain a $P$-type semiconductor,we must dope the intrinsic semiconductor $(Si)$ with a trivalent impurity atom.$Si$ belongs to group $14$ of th

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Aluminium

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(A) To obtain a $P$-type semiconductor,we must dope the intrinsic semiconductor $(Si)$ with a trivalent impurity atom.$Si$ belongs to group $14$ of the periodic table and has $4$ valence electrons.Aluminium $(Al)$ belongs to group $13$ and has $3$ valence electrons.When $Al$ is added to $Si$,it creates a hole (vacancy) in the crystal lattice,which acts as a charge carrier,resulting in a $P$-type semiconductor.Phosphorous is a pentavalent impurity used for $N$-type semiconductors.

To obtain $P$-type $Si$ semiconductor,we need to dope pure $Si$ with

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