What are extrinsic semiconductors? Describe p-type and
n-type semiconductors.
Answers
Explanation:
An extrinsic semiconductor is one that has been doped; during manufacture of the semiconductor crystal a trace element or chemical called a doping agent has been incorporated chemically into the crystal, for the purpose of giving it different electrical properties than the pure semiconductor crystal, which is called an intrinsic semiconductor. In an extrinsic semiconductor it is these foreign dopant atoms in the crystal lattice that mainly provide the charge carriers which carry electric current through the crystal.
An N-Type semiconductor is created by adding pentavalent impurities like phosphorus (P), arsenic (As), antimony (Sb), or bismuth (Bi). ... The impurities are called dopants. The purpose of doing this is to make more charge carriers, or electron wires available in the material for conduction.
In p-type semiconductors, holes are the majority carriers and electrons are the minority carriers. P-type semiconductors are created by doping an intrinsic semiconductor with acceptor impurities (or doping an n-type semiconductor). A common p-type dopant for silicon is boron.
Answer:
An extrinsic semiconductor is a semiconductor doped by a specific impurity which is able to deeply modify its electrical properties, making it suitable for electronic applications (diodes, transistors, etc.) or optoelectronic applications (light emitters and detectors).
when a semiconductor is doped with a trivalent atom, holes are the majority charge carriers are called p type semiconductor.
when a semiconductor is doped with pentavalent atom, electrons are the majority charge carriers are called n type semiconductor
hope this will help you