SOLUTION

The pair of acceptor impurities for the semiconductor material is Gallium and Indium.

• Replacing some Si atoms with atoms from Group III (boron, gallium, indium—also known as acceptor impurities), which have three valence electrons, will create a p-type material.
• Because four valence electrons are required to form and complete all adjacent electron-pair bonds, a hole is created by the missing bond.
• A hole can be considered a positive charge which can diffuse or drift through a crystal
• The resultant current in p-type material is thus primarily by positive charges, which are also referred to as majority carriers. p-type doping is illustrated in Fig.