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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
MCQ
Hole is:
  • A
    An anti-particle of electron.
  • B
    A vacancy created when an electron leaves a covalent bond.
  • C
    Absence of free electrons.
  • D
    An artifically created particle.
✓

Answer

  1. A vacancy created when an electron leaves a covalent bond.

Solution:

Concept of holes in the semiconductor:

  1. When an electron is removed from a covalent bond, it leaves a vacancy behind. An electron from a neighbouring atom can move into this vacancy, leaving the neighbour with a vacancy. In this way the vacancy formed is called a hole (or cotter), and can travel through the material and serve as an additional current carriers.
  2. A hole is considered as a seat of positive charge, having magnitude of charge equal to that of an electron.
  3. Holes acts as a virtual charge, although there is no physical charge on it.
  4. Effective mass of hole is more than an electron.
  5. Mobility of hole is less than an electron.

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