Question

Consider an ideal intrinsic semiconductor in thermal equilibrium. No external forces or fields are applied to this semiconductor. At temperatures above 0 K, the electron concentration in the conduction band is non-zero because
A: some electrons from dopant atoms will overcome the bandgap by gained thermal energy.
B: some electrons from dopant atoms will overcome the ionization energy by gained thermal energy.
C: some electrons from the conduction band will overcome the bandgap by gained thermal energy.
D: some electrons from the valence band will overcome the bandgap by gained thermal energy.

Answer 1

At temperatures above 0 K, the electron concentration in the conduction band is non-zero because some electrons from the valence band will overcome the bandgap by gained thermal energy. The correct option is D.

What are electrons?

The electrons are the spinning objects around the nucleus of the atom of the element in an orbit.

Consider an ideal intrinsic semiconductor in thermal equilibrium. No external forces or fields are applied to this semiconductor.  At temperatures above 0 K, the electron concentration in the conduction band is non-zero because some electrons from the valence band will overcome the bandgap by gained thermal energy.

The semiconductors are free from impurities. At room temperature. Some electrons ion valence band gains energy and cross the bandgap. They get transferred to the conduction band.

Thus, the correct option is D.

Learn more about electrons.

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