N-type semiconductor, Physics

Assignment Help:

Consider a pentavalent impurity such as phosphorus (P, Z = 15) is doped in a pure semiconductor germanium (Ge, Z = 320. Each phosphorus atom forms four covalent bonds with four germanium atoms as shown in the figure. Thus fifth electron does not take part in the formation of covalent bonds. Hence it is free. This means the phosphorus atom has an excess of one electron and is ready to donate. Therefore all such pentavalent impurities are called ‘donors'. Thus, a small quantity of phosphorus provides millions of electrons in a n-type semiconductor which are excess in number compared to number of holes available for conduction. The resulting semiconductor is called a n-type semiconductor.

 

1087_n type semicounductore.png

A n-type semiconductor is formed when a small quantity of donor impurity is added to a pure semiconductor. In a n-type semiconductor, conduction is mainly by means of electrons in the conduction band. Electrons are majority carriers and holes are minority carriers in a n-type semiconductor.

 


Related Discussions:- N-type semiconductor

Faradays law, FARADAYS LAW: When the magnetic flux through the coil is ...

FARADAYS LAW: When the magnetic flux through the coil is made to vary, an emf is induced in the coil.  The magnitude of the induced emf is proportional to the rate of change of

What is a neutron, What is a neutron? A neutron is a subatomic particle...

What is a neutron? A neutron is a subatomic particle. Neutron is one of the building blocks of the atom. It has a mass of about 1.675 x 10-27 kg. Its spin is + 1/2 and that

Production of electricity by light, Production of electricity by light: ...

Production of electricity by light: The Photovoltaic Cell or Solar Cell. A photovoltaic cell generates an emf when light falls onto it. Several forms of photovoltaic cell exi

What is the kinetic energy of the electron, An electron is unrestricted fro...

An electron is unrestricted from rest at a point in an evacuated region of space at which the electric potential is 5.0 volts. No force except the force of the electric field chara

Explain general theory of gravitation, Explain General Theory of Gravitatio...

Explain General Theory of Gravitation The idea of a gravitational field takes all the gravitational effects of a given mass like Earth and expresses them mathematically as a grav

Physics Project - Black Holes, I really just need an interview with someone...

I really just need an interview with someone (it''s a total of nine questions). I have had trouble getting responses and I''m getting desperate about making my deadline. I will als

Michelson interferometer., why michelson interferometer is called interferr...

why michelson interferometer is called interferrometer

Kinematics, how to solve question for kinematics problem

how to solve question for kinematics problem

Zero error of screw gauge, In a perfect instrument the zeros of the major s...

In a perfect instrument the zeros of the major scale and circular scale coincides with each other, in that situation screw gauge has zero-error, or else the measurement device is s

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd