/doh"peuhnt/, n. 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.
[1960-65; DOPE + -ANT]

* * *

Any impurity added to a semiconductor to modify its electrical conductivity.

The most common semiconductors, silicon and germanium, form crystalline lattices in which each atom shares electrons with four neighbours (see bonding). Replacing some atoms with donor atoms (e.g., phosphorus, arsenic) that have five bonding electrons makes extra electrons available. The semiconductor thus doped is called n-type (for negative, because of the additional negative charges). Doping with acceptor atoms (e.g., gallium), which have only three electrons available, creates "holes," which are positively charged. Conduction can occur by migration of holes through the crystal structure of such a semiconductor, known as p-type (for positive).

* * *

      any impurity deliberately added to a semiconductor for the purpose of modifying its electrical conductivity. The most commonly used elemental semiconductors are silicon and germanium, which form crystalline lattices in which each atom shares one electron with each of its four nearest neighbours. If a small proportion of the atoms in such a lattice is replaced by atoms such as phosphorus or arsenic, which have five electrons available for bond formation, the extra electron of each such dopant atom becomes available for electrical conduction. The semiconductor is then said to be doped with phosphorus or arsenic, which are called donor atoms, and the semiconductor is classed as n-type (n for negative, because the charge carriers are electrons, which are negatively charged particles). Doping with atoms such as boron or indium, which have only three electrons available, creates a positively charged site, or “ hole,” in the bonding arrangement. Conduction can occur by migration of the positively charged site through the crystal lattice, and a semiconductor doped with an atom of this type, an acceptor atom, is called p-type.

* * *

Universalium. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • dopant — dopant, ante [ dɔpɑ̃, ɑ̃t ] n. m. et adj. • 1952; de doper 1 ♦ Substance chimique propre à doper, à dissiper (momentanément) la fatigue. ⇒ excitant, stimulant; doping. Les anabolisants sont des dopants. Adj. User de substances dopantes. 2 ♦ Techn …   Encyclopédie Universelle

  • Dopant — Dop ant (d[=o]p ant), n. 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. [PJC] …   The Collaborative International Dictionary of English

  • Dopant —   [dt. »Dotiersubstanz«], Halbleiter …   Universal-Lexikon

  • dopant — dopánt s. n., pl. dopánte Trimis de siveco, 19.03.2005. Sursa: Dicţionar ortografic …   Dicționar Român

  • dopant — [dōp′ənt] n. [ DOP(E) + ANT] an impurity added to a pure substance to produce a deliberate change, as with laser crystals and semiconductors: also called doping agent …   English World dictionary

  • Dopant — This article is about elemental impurities. For the fictional characters in Kamen Rider W, see Dopant (Kamen Rider). A dopant, also called a doping agent, is a trace impurity element that is inserted into a substance (in very low concentrations)… …   Wikipedia

  • dopant — legiruojamoji priemaiša statusas T sritis automatika atitikmenys: angl. dopant; dopant impurity vok. Dotant, m; Dotierstoff, m; Dotierungsmittel, n rus. легирующая примесь, f pranc. dopant, m; impureté dopante, f …   Automatikos terminų žodynas

  • Dopant —   A chemical element (impurity) added in small amounts to an otherwise pure semiconductor material to modify the electrical properties of the material. An n dopant introduces more electrons. A p dopant creates electron vacancies (holes) …   Energy terms

  • dopant — legiruojančioji medžiaga statusas T sritis radioelektronika atitikmenys: angl. dopant; doping agent vok. Dotiermittel, n; Dotierungsmittel, n; Dotierungssubtanz, f; Zusatzmittel, n rus. легирующее вещество, n pranc. dopant, m …   Radioelektronikos terminų žodynas

  • dopant — legiravimo medžiaga statusas T sritis fizika atitikmenys: angl. dopant material; doping material vok. Dotierungsmaterial, n; Legierungsstoff, f rus. легирующее вещество, n pranc. dopant, m; élément d’alliage, m …   Fizikos terminų žodynas

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”