dopant

[doh-puhnt]
noun Electronics.
an impurity added intentionally in a very small, controlled amount to a pure semiconductor to change its electrical properties: Arsenic is a dopant for silicon.

Origin:
1960–65; dope + -ant

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World English Dictionary
dopant (ˈdəʊpənt)
 
n
an element or compound used to dope a semiconductor
 
[C20: see dope, -ant]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
These phenomena can be accounted for if chemical processes in the gas phase, which involve the dopant, are considered.
Some dopant gases that are used include arsine, phosphine, and diborane.
The absence of photochemical activity may result from dopant-induced trap and/or recombination sites within the film.
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