N-type semiconductor, Physics

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.

 

Posted Date: 8/29/2012 1:44:28 AM | Location : United States







Related Discussions:- N-type semiconductor, Assignment Help, Ask Question on N-type semiconductor, Get Answer, Expert's Help, N-type semiconductor Discussions

Write discussion on N-type semiconductor
Your posts are moderated
Related Questions
No;(Personal Note:Please Rate this and let me know if this helps) Reason: From the quantisation of charge charactersistic, we can say that charge comes in integral multiple of e (

The nucleus of helium contains : (1)Four protons (2)Four neutrons (3)Two neutrons and two protons (4)Four protons and two electrons Ans: (3)Two neutrons and two prot

Alternating Current: (AC) Such a current can be obtained if a resistor is linked in series with a source of alternating voltage. This current alters its direction so many times

Determine an expression for the current in the ring jumping ring demonstration, an electromagnet provides magnetic field of B=0.2 cos 377t tesla over a circle of radius 1.2cm

Maximum Height of Ball A solid ball is revolve toward a ramp. How elevated will it be when it stops and begins to roll back down? The linear kinetic energy like the bal

Describe the operation of a transistor amplifier in CE configuration. Ans:  Operation  of  a  Transistor  Amplifier  in  CE  configuration:    A  Common  Emitter  NPN transist

differentiate between direct and indirect band gaps

A helium nucleus and a neon nucleus are separated by a distance of 3.0 nm. The charge of the helium nucleus is +2e while that of a neon nucleus is + 10e .Find the magnitude of the

How to find out neutral point ? What all things we require to equate or form a equation to find the neutral poind and how to do it?

The energy band formed by a series of energy levels having valence electrons is called as valence band. At 0 K, the electrons fulfill the energy levels in valence band initialising