Question

Semiconductors formed by doping germanium (Ge) with aluminium (Z = 13) and antimony (Z = 51) are ______.

Options

• intrinsic semiconductors.

• both p-type semiconductors.

• n-type and p-type semiconductors respectively.

• p-type and n-type semiconductors respectively.

Answer 1

Semiconductors formed by doping germanium (Ge) with aluminium (Z = 13) and antimony (Z = 51) are p-type and n-type semiconductors respectively.

Explanation:

The element aluminium (Z = 13) is a trivalent one. As a result, when doped on germanium, it acts as an acceptor impurity, resulting in the creation of a p-type semiconductor (Ge). Similarly, adding antimony (Z = 51), a pentavalent impurity, causes n-type semiconductor formation.