Main Page | See live article | Alphabetical index A dopant is an impurity that is added in small amounts to a pure substance to change its properties. Examples Boron, arsenic, and antimony, among other substances, are used as dopants when added to a pure semiconductor material to alter its electrical characteristics. Artificially produced gemstones (such as Ruby (gemstone)) usually contain a dopant to identify them as such. Also called: Dope, Doping Agent This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.