Energy Bands#!#Semiconductor

The forbidden energy band gap in conductors, semiconductors and insulators are EG_(1), EG_(2) and EG_(3) respectively. How are they related?

The energy band gap (difference between conductor band and valance band) in semiconductors is

The forbidden energy band gap in conductors, semiconductors and insulators are EG_(1), EG_(2) and EG_(3) respectively. The relation among them is

Assertion : The electrons in the conduction band have higher energy than those in the valence band of a semiconductor Reason : The conduction band lies above the energy gap and valence band lies below the energy gap.

Explain the formation of energy band diagram in case of conductor and semiconductor.

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 1240 nm is incident on it. The forbidden band energy for the semi conductor is (in eV).

Statement-1 : When the temperature of a semiconductor is increased, then its resistance decreases. Statement-2 : The energy gap between conduction band and valence band is very small for semiconductor.