In a semiconductor, the energy gap between the valence band and conduction band is about________
Right Answer is:
In a semiconductor, the energy gap between the valence band and conduction band is about 1ev. The forbidden energy gap for germanium is 0. 7 em and for silicon 1.1 em.
Because the Fermi level is located near the middle of the gap for a semiconductor and Energy gap Eg is small, appreciable numbers of electrons are thermally excited from the valence band to the conduction band.
The empty levels above the thermally filled levels in the conduction band, a small applied potential difference can easily raise the energy of the electrons in the conduction band, resulting in a moderate current.