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(D) To obtain electrons as majority charge carriers in a semiconductor,we need to create an $n$-type semiconductor. This is achieved by doping an intr

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Pentavalent

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(D) To obtain electrons as majority charge carriers in a semiconductor,we need to create an $n$-type semiconductor. This is achieved by doping an intrinsic semiconductor (like $Si$ or $Ge$) with pentavalent impurity atoms (such as $P$,$As$,or $Sb$). These pentavalent atoms have $5$ valence electrons,where $4$ electrons form covalent bonds with the host atoms and the $5$th electron becomes free to conduct electricity,thus making electrons the majority charge carriers.

To obtain electrons as majority charge carriers in a semiconductor,the impurity mixed is

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