The process of introducing dopants into a semiconductor is called Doping .
The addition of a dopant to a Semiconductor has the effect of shifting the Fermi Level within the material. This results in a material with predominantly negative ( N Type ) or positive ( P Type ) Charge Carrier s depending on the dopant species. Pure semiconductors altered by the presence of dopants are known as Extrinsic Semiconductor s (''cf.'' Intrinsic Semiconductor ). Dopants are introduced into semiconductors in a variety of ways including Ion Implantation and surface Diffusion .
- Artificially produced Gemstones (such as Rubies ) sometimes contain a dopant to identify them as such.
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