minority carrier injection
- minority carrier injection
-
in electronics, a process taking place at the boundary between
-type and
-type
semiconductor materials, used in some types of transistors (
transistor). Each semiconductor material contains two types of freely moving charges: electrons (
electron) (negative charges) and holes (
hole) (positive charges). Electrons are the more abundant, or majority, carrier in
n-type materials, holes being the less abundant, or minority, carrier. In
p-type materials, however, holes are the majority carrier, and electrons the minority carrier. If a
battery is properly connected to the semiconductor material, the
p-type material may acquire additional electrons (minority carriers), injected into the
p-type material from the
n-type material by the flow of electrons from the battery. This is minority carrier injection. It is important in bipolar junction transistors, which are made of two
p-
n junctions.
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Universalium.
2010.
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