p-type semiconductor, Physics

Assignment Help:

p-type semiconductor: Consider a trivalent impurity such as Gallium (Ga, Z = 31) is doped in a pure semiconductor germanium (Ge, Z = 32).

Each Ga atom forms three covalent bonds with three germanium atoms as shown in the figure. In the fourth covalent bond, only Ge atom contributes one valence electron, while Ga has no electron to contribute. Thus, the fourth bond is incomplete, being short of one electron. This missing electron is called a ‘hole'. Ga atom is ready to accept one electron and hence all such trivalent impurities are called acceptors. A small amount of Ga provides millions of holes which are more in number than electrons available for conduction.The resulting semiconductor is called a p-type semiconductor. A p-type semiconductor is formed when a small quantity of acceptor impurity is added to the pure semiconductor.
In a p-type semiconductor, conduction is mainly by means of holes in the valence band. Hence holes are majority carriers and electrons are minority carriers in a p- type semiconductor.

1377_p type semicounductore.png


Related Discussions:- p-type semiconductor

The original frequency of the tunning fork, A tunning fork produces 4 beats...

A tunning fork produces 4 beats per second with another tunning fork of frequency 256 Hz. The first one is now loaded with a little wax and the beat frequency is found to enhance t

Classes of magnetic materials: antiferromagnetism, Anti ferromagnetic mater...

Anti ferromagnetic materials such as chromium have a small but positive susceptibility. They cannot possess any magnetization is the absence of an applied field, in contrast to fer

Project, project of class12,,to demonstrate electrostatics shielding

project of class12,,to demonstrate electrostatics shielding

What are semiconductors, What are semiconductors? Give an example for n-typ...

What are semiconductors? Give an example for n-type semiconductors. Semiconductors are materials having electrical conductivity among that of insulators and conductors. This i

Sound waves and the eardrum, Sound Waves and the Eardrum While a pressu...

Sound Waves and the Eardrum While a pressure wave reaches the ear and a series of high and low pressure regions impinge upon the eardrum. An arrival of a compression or high pr

Diffrence between push and pull of an object, Q. Illustrate why is there mo...

Q. Illustrate why is there more friction when you push an object than when you pull it? Answer:- Friction doesn't differ depending upon whether an object is pushed or pull

Define wave function, It is a mathematical explanation of the disturbance p...

It is a mathematical explanation of the disturbance prepared by a ray. For a string, the wave function is a distance for sound rays. It is a density or pressure fluctuation while f

Eotvos law of capillarity, Eotvos law of capillarity (Baron L. von Eotvos; ...

Eotvos law of capillarity (Baron L. von Eotvos; c. 1870): The surface tension gamma of liquid is associated to its temperature T, the liquid's critical temperature, T*, & its

Expression for the energy stored in a capacitor, Derive a mathematical expr...

Derive a mathematical expression for the energy stored in a capacitor. What is the energy stored when the space between the plates is filled with a dielectric a) With chargi

Subset [tabular method], 1.A=the set of whole numbers less tan 4 ? 2.B=the ...

1.A=the set of whole numbers less tan 4 ? 2.B=the set of prime numbers less than 19 ? 3.C=the set of first three days of week?

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