Q36 / 150 · MHT CET 2025 (5 May Shift 2) · Chemistry

Which of the following dopant is added in silicon to obtain n-type semiconductor?

  • Correct answer
    A
    As
  • B
    B
  • C
    Ga
  • D
    ln

Solution

To create an n-type semiconductor from silicon, a pentavalent impurity from Group 15 is introduced. These elements possess five valence electrons, with four forming covalent bonds with silicon atoms and the fifth becoming a conduction electron.

Arsenic (As) is a Group 15 element, functioning as a donor impurity that provides free electrons. Boron (B), gallium (Ga), and indium (In) are Group 13 elements that create p-type semiconductors by accepting electrons.

Hence, the correct answer is option: 'A'.

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