Why boron is used as a doping element?

Answer 1

The familiar semi conducting materials are Silicon (Si) and Germanium (Ge)

These belong to fourth group as they have four valence electrons.

Now we need doping material whose valency may be either 5 (one more than 4) or trivalent (one less). By using one less ie trivalent material we can produce P type Si or P type Ge. Hence we add Boron, which is trivalent just as Aluminium along with Ge or Si.

Answer 2

Boron is used as a doping element in semiconductors because it has one less electron than silicon, making it a p-type dopant. By introducing boron into silicon, it creates "holes" in the crystal structure which can carry positive charges, allowing for the creation of p-n junctions and the production of diodes and transistors.