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KCET2020PhysicsSemiconductors

A positive hole in a semiconductor is

Options

  1. Aan anti-particle of electron
  2. Ba vacancy created when an electron leaves a covalent bond
  3. Cabsence of free electrons
  4. Dan artificially created particle

Correct answer

B. a vacancy created when an electron leaves a covalent bond

Step-by-step solution

At room temperature, some of the valence electrons acquire thermal energy greater than E_ g (energy gap between conduction and valence band ) and some of the valence electrons becomes free. Thus, we can say that a valence electron is shifted to conduction band leaving a vacancy of electron in valence. This vacancy is known as hole and carries a positive charge.

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