<P> In semiconductor production, doping is the intentional introduction of impurities into an intrinsic semiconductor for the purpose of modulating its electrical and optical and structural properties . The doped material is referred to as an extrinsic semiconductor . A semiconductor doped to such high levels that it acts more like a conductor than a semiconductor is referred to as a degenerate semiconductor . </P> <P> In the context of phosphors and scintillators, doping is better known as activation . Doping is also used to control the color in some pigments . </P>

What is the purpose of doping a semiconductor