Physics - Semiconductors Question with Solution | TestHub

In an n-type semiconductor, pentavalent impurity atoms are added, which act as donors. These donor atoms introduce a new energy level called the donor energy level.

The donor energy level is located in the forbidden energy gap (band gap) just below the bottom of the conduction band. Because it is very close to the conduction band, electrons from the donor level can easily be excited into the conduction band even at room temperature, increasing the electrical conductivity of the semiconductor.

Answer: the band gap and are close to the conduction band.