Question

An intrinsic semiconductor has equal number of electrons and holes in it. This is due to
1. doping
2. free electrons
3. thermal energy
4. valence electrons

Answer 1

Correct Answer - Option 3 : thermal energy

• In a semiconductor, the charged carriers are both electrons and holes
• In Intrinsic Semiconductors, at room Temperature, the valence band is completely filled and conduction band is completely empty
• Intrinsic Semiconductor is Insulators at room Temperature
• Intrinsic semiconductor has equal number of electrons and holes due to thermal generation across the bandgap, E_g.
• It corresponds to a pure semiconductor crystal in which there are no impurities and crystal defects to cause an effective doping of the crystal.