How does boron doping change the electrical conductivity of silicon?

Doping silicon with boron increases its electrical conductivity by transforming it into a p-type semiconductor.12

Because boron is a trivalent atom with only three outer electrons, it creates a deficiency when substituted for a silicon atom in a crystal lattice. To complete the four covalent bonds required by the surrounding silicon atoms, the boron atom accepts an electron, which results in the creation of a positively charged hole in the valence band.123

In this process, the boron acts as an acceptor atom. The presence of these additional holes increases the total number of charge carriers available to move through the crystal lattice when an electric field is applied, thereby enhancing the material's ability to conduct electricity compared to pure, intrinsic silicon.23