Q49 / 180 · KCET 2020 · Chemistry

Silicon doped with gallium forms

  • A
    $n$-type semiconductor
  • B
    both $n$ and $p$-type semiconductor
  • C
    an intrinsic semiconductor
  • Correct answer
    D
    $p$-type semiconductor

Solution

Silicon belongs to group 14 and gallium comes in group 13. So, when Si is doped with Ga, $p$-type of semiconductor is produced as group 13 elements have only 3 valence electrons, there on combination with group 14 elements produce an electron deficient bond or have electron vacancy and as such can move through the crystal like a positive charge giving rise to electrical conductivity.

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

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