In semiconductor at a room temperature

Options

A. The velence band is partially empty and the conduction band is partially filled
B. The velence band is completely filled and the conduction band is partially filled
C. The velence band is completely filled
D. The conduction band is completely empty

Answer

A

Explanation

The energy band scheme of semiconductors is shown here.

In semiconductors, valence gap called the forbidden energy gap. It is vely small. At room temperature some electrons in valence band acquire thermal energy. this energy is more than forbidden energy gap `E_(g)`, thus they jump into the conduction band and leave their vacancy in the valnce band which act as holes. Hence, at room temperature valence band is partially empty and conduction band is partially filled.