A semiconductor type in which the density of electrons in the conduction band is exceeded by the density of holes in the valence band. P-type behavior is induced by the addition of acceptor impurities, such as boron, to the crystal structure of silicon. See also acceptors , dopants , donors and impurities . PVD P hysical V apor D eposition. A process for depositing a thin film on a wafer that involves aiming a stream of gas at a target.
Secondary emission releases material from the target which is then deposited on the wafer.
This process is also know as sputtering. A form of analog control in which the duration of digital pulses is varied analogously with the signal of interest.