How does an acceptor atom create a hole in a silicon crystal?

In a silicon crystal, each silicon atom shares its four outer electrons with four neighboring atoms to form covalent bonds.12

When a trivalent atom—such as boron—is introduced into the crystal lattice as a dopant, it replaces a silicon atom. Because this acceptor atom has only three outer electrons, it lacks the fourth electron required to complete the four covalent bonds with its neighboring silicon atoms. To satisfy the bonding structure, the boron atom accepts an electron from the surrounding lattice. This process leaves behind an electron vacancy in the valence band, which is referred to as a hole.13245

This hole acts as a positively charged carrier, allowing for electrical conduction in what is known as a p-type semiconductor.354