What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?
Why Doping a silicon crystal with a trivalent element such as boron, gallium or indium leaves one bonding site short of an electron. That vacancy is a hole, and because the impurity atom readily accepts an electron from a neighboring bond, it is called an acceptor impurity. Acceptor doping produces P-type material, where holes are the majority carriers.
Watch out A donor impurity is the opposite case: a pentavalent atom like phosphorus or arsenic donates an extra free electron and creates N-type material. 'N-type impurity' points at that same electron-adding side of the story.
Acceptor Accepts electrons, so it Adds holes = P-type. Donor Donates electrons = N-type.
A hole is an empty seat waiting to accept an electron, so holes come from Acceptor impurities. Donors give electrons.