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

Sketch a motion diagram, You may find parts of this question similar to the...

You may find parts of this question similar to the \Landing on an Alien World" activity that we did some time ago in class. Start by opening the \Maze Game" activity. You can find

Circular motion, In an amusement park ride called The Roundup, passengers s...

In an amusement park ride called The Roundup, passengers stand inside a 19.0 -diameter rotating ring. After the ring has acquired sufficient speed, it tilts into a vertical plane.

Resolution of forces, Resolution of Forces: This topic is important, bu...

Resolution of Forces: This topic is important, but is really the opposite to Addition of forces. Recalling that two forces can be added to give a single force known

Determine the change in specific internal energy of the air, (i) A disk sha...

(i) A disk shaped flywheel of uniform density _, outer radius R and thickness w. rotates with angular velocity _, obtain an expression for the moment of inertia 2 vol I =_ρ r dV

Explain the working of a refrigerator, Explain the working of a refrigerato...

Explain the working of a refrigerator A refrigerator is the reverse of a heat engine. Here the working substance extracts heat Q2 from the cold reservoir at temperature T2, som

Common lead acid battery faults, common lead acid battery faults: Caref...

common lead acid battery faults: Careful treatment of lead acid batteries prevents damage and early failure, however, some common faults associated with lead acid batteries are

Vitreous enamel capacitors, These capacitors are made using vitreous enamel...

These capacitors are made using vitreous enamel on mixture of silica, alkali oxides and fluorides as dielectrics. These capacitors are formed by spraying vitreous lacquer on metal

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