Donor IMPURITIES (such as ARSENIC, antimony, bismuth or phosphorous) when ADDED to a pure semiconductor lattice, form N-type extrinsic semiconductor. The pentavalent impurities are called donor impurities as such impurities donate ELECTRONS to the lattice.

Acceptor impurities (such as boron, gallium, indium or aluminium) when added to a semiconductor lattice form P-type extrinsic semiconductor. The trivalent impurities are called acceptor impurities because such impurities accept electrons from the lattice.

Donor impurities (such as arsenic, antimony, bismuth or phosphorous) when added to a pure semiconductor lattice, form N-type extrinsic semiconductor. The pentavalent impurities are called donor impurities as such impurities donate electrons to the lattice.

Acceptor impurities (such as boron, gallium, indium or aluminium) when added to a semiconductor lattice form P-type extrinsic semiconductor. The trivalent impurities are called acceptor impurities because such impurities accept electrons from the lattice.