Extrinsic Semiconductors Flashcards
the process of adding small quantities of particular impurity to an intrinsically pure semiconductor in order to alter its
conducting properties
Doping
are materials that have been subjected to doping
Extrinsic
are materials added to a pure
semiconductor thus making the
semiconductor not pure anymore
Impurity
Types of Impurities
Pentavalent Impurity, Trivalent Impurity
Pentavalent Impurity
Five valence electrons
Donor Atoms
Gives off free electron
when doped
Trivalent Impurity
Three valence electrons
Acceptor Atoms
Creates holes when doped
Pentavalent Impurity examples
Arsenic (As)
Phosphorus (P)
Bismuth (Bi)
Antimony (Sb)
Trivalent Impurity examples
Boron (B)
Indium (In)
Gallium (Ga)
To increase the number
of conduction electrons in
an intrinsic
semiconductor crystal , a
pentavalent impurity is
added.
n-type
extrinsic semiconductor.
To increase the number
of holes in an intrinsic
semiconductor crystal , a
trivalent impurity is
added. The resulting
material is an
p-type
extrinsic semiconductor.
N-type semiconductor crystal
showing that the _____ are the ______ resulted from doping
and some ______
which are _____ thermally
produced.
majority
charge carriers, ree
electrons,minority carriers,
P-type semiconductor crystal
showing that the ___ are the ___
resulted from doping and some
_______which are
_________ thermally
produced.
majority
charge carriers , holes,minority carriers,free electrons
In an ______ the ____ is
called the ____ and the ____ is
the _______.
n-type material ,electron,majority carrier, hole,minority carrier
In a _____ the ___ is the
______ and the ____ is the
_______.
p-type material , hole, majority carrier ,electron,minority carrier
