a foreign substance added to a material to alter its properties; -- a process used. e.g., in making semiconductors from pure silicon in the manufacture of semiconductor chips and integrated circuits.
An element incorporated in trace amounts into single crystal silicon or epitaxial layers to establish their conductivity type and resistivity and create n-type or p-type silicon. Dopants are classifed as either acceptors or donors.
A small and controlled amount of impurity, such as arsenic in silicon, purposely added to a pure semiconductor to change its electrical properties.