Which of the following is NOT a trivalent impurity?

Which of the following is NOT a trivalent impurity? Correct Answer Phosphorus

Important Points:

• P-type semiconductor: The semiconductor having holes as majority charge carriers and electrons as a minority charge carrier is called as P-type semiconductor.
• Extrinsic N-Type Semiconductor is formed when a trivalent impurity is added to a pure semiconductor.
• Example of trivalent impurity are Boron, Gallium and Indium
• Trivalent impurity like boron, have 3 valence electrons
• Each atom of the impurity fits in the silicon crystal by forming covalent bonds with the surrounding silicon atoms
• The dopant boron atom has one less electron than surrounding silicon and thus vacancy is generated that acts as a hole.

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N-type semiconductor: The semiconductor having electrons as majority charge carriers and holes as a minority charge carrier are called as N-type semiconductor.

• When pentavalent impurity is doped in intrinsic semiconductor then we got N-type semiconductor. For example: Arsenic, Phosphorus etc.