Question

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Q.Why are elemental dopants for Silicon or Germanium usually chosen from group XIII or group XV?


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Answer 1

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When poor semiconductor material is mixed with small amount of certain specific impurities with valency different from that of the parent material,the number of mobile electrons changes.

The process of addition of impurity is called Doping. The size of the dopant item should be compatible such that there presence in the pure semiconductor doesn't distort the semi-conductor but easily contribute the charge carriers on forming covelant bonds with Silicon or Germanium atoms,which are provided by group Xlll or group XV elements.

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Answer 2

Explanation:

Bcz of increasing impurities also called as doppling elemental dopants for Silicon or Germanium usually chosen from group XIII or group XV.