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
AC Input Resistance in Common Base Configuration Ratio of change in emitter base  voltage  (?V EB )  to  the  resulting  change  in  emitter  current  (?I E )  is  called in

(a) Using the thermochemical tables provided, calculate the standard molar enthalpy of combustion at 298 K for the following hydrocarbon:  C C 2 H 4 (g ) (ethene)  (b)  If

COHERENCE : 1) Visible light energy is emitted when the excited electrons in atoms undergo transitions to the ground state. 2) In ordinary light sources, these transitions

Energy Transformation for a Dart In that case of the dart being launched from the spring gun and the just forces doing work upon the dart are internal forces. Initially, the da

Q. What is the density of energy states in metals? Obtain an expression for the density of states for free electron gas in metals.   Ans.  Density of energy state is define

bcs theory of superconductivity.

Newton's laws of motion (Sir I. Newton) Newton's first law of motion A body remain continues in its state of constant velocity (that may be zero) unless it is acted on

Describe the internals of a light-emitting diode (LEO). Describe what happens internally when sufficient current is applied to activate LED.  What isthe device pictured? Wh

Superfluidity: The phenomena through which, at sufficiently low temperatures, a fluid can flow along zero viscosity. Its causes are related with superconductivity.

The parachute on a race car that weighs 8750 N opens at the end of a quarter-mile run when the car is traveling 38 m/s. What net retarding force (magnitude) must be supplied by the