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KCET2020ChemistryClassification of Elements and Periodicity in Properties

Silicon doped with gallium forms

Options

  1. An -type semiconductor
  2. Bboth n and p -type semiconductor
  3. Can intrinsic semiconductor
  4. Dp -type semiconductor

Correct answer

D. p -type semiconductor

Step-by-step 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.

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