Majority and minority charge carriers , Physics

Assignment Help:

Majority and minority charge carriers 

A pure semiconductor has equal number of holes and electrons. But an extrinsic semiconductor has majority charge carriers.


When a trivalent impurity is introduced into a semiconductor substance, every impurity atom leaves an electron deficiency called ‘hole' along with thermally generated holes and electrons. Some of the electrons recombine with holes, so the number of electrons get reduced. Hence holes become majority charge carriers as they are large in number and electrons become minority charge carriers. When a pentavalent impurity is added, every impurity atom leaves an electron in addition to the existing number. 

Some of the electrons and holes recombine. This results in number of holes to reduce and number of electrons increase. Hence electrons become majority charge carriers and holes become minority charge carriers.


Related Discussions:- Majority and minority charge carriers

What are multistranded fibers, What are multistranded fibers? Multistra...

What are multistranded fibers? Multistranded optics is narrow walled tubes of transparent material that housing a number of smaller solid core fibers. These inner fibers are, u

Illustrates some way to by which ultrasonic waves propagated, Illustrates s...

Illustrates some way to by which ultrasonic waves propagated? Detection of Ultrasonic Waves: Ultrasonic waves propagated by a medium can be detected within a number of ways.

Diffraction grating, when told that a diffraction grating has 80 lines per ...

when told that a diffraction grating has 80 lines per mm we need to work out what 1 line would equal. I have the solution but i cannot figure out how they got 1 line to equal 1x10

VIMA, Sir What''s The Meaning/Spelling of Word VIMA In English.

Sir What''s The Meaning/Spelling of Word VIMA In English.

Do glass or polymer transmits the radiation, Do glass or polymer transmits ...

Do glass or polymer transmits the radiation? There is not a simple answer since it will always depend on the last use and working conditions of the system. Usually speaking gla

Circuits involving capacitive decay, Circuits involving capacitive decay: ...

Circuits involving capacitive decay: Consider the circuit shown below. Depending on the time constant of the circuit, relative to the period of the square wave applied to it,

Laws of motion, A bob hanged to astrirg in a box .it is displaced to an agl...

A bob hanged to astrirg in a box .it is displaced to an agle of 45 .then fid the acceleration of the box at this moment. Ans) gsin45,that is 10/1.4142.as it would have only tangen

Explain slip-ring, Explain Slip-ring Slip-ring (or phase- wound)  ro...

Explain Slip-ring Slip-ring (or phase- wound)  rotor having of a slotted laminated core of sheet steel. A three- phase winding is placed in the rotor slots. The rotor windin

Explain transverse waves, Transverse Waves: The traveling waves in whic...

Transverse Waves: The traveling waves in which particles of the elastic medium vibrate about perpendicular to the direction of propagation of waves are known as transverse wave

Give any three applications of the superconductors, Q. Give any three appli...

Q. Give any three applications of the superconductors. i) High efficiency ore-separating machines may be built using superconducting magnets which can be used to separate tumou

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