p-type semiconductor, Physics

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

Posted Date: 8/29/2012 1:41:36 AM | Location : United States







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

Write discussion on p-type semiconductor
Your posts are moderated
Related Questions
A negative point charge of 10 -6 coulomb is located in air at the origin of a rectangular coordinate system. A second negative point charge of 10 -4 is situated on the positive x

Explain about the intermodal dispersion in optical fibers. Intermodal Dispersion Δτ im ) This dispersion arises even when light that is launched into the fiber is s

What instrument is used to measure volume? Liquid volume is calculated with beakers, measuring cups, spoons, graduated cylinders, and the like. For regular objects, solid volum

An alternating voltage v=250sin800t volts is applied across a series circuit having a 30 resistor and 50µF capacitor. Calculate (a) the circuit impedance, (b) the current ?

Definition of semiconductors Photovoltaic (PV) cells are made of special materials known as semiconductors like as silicon, which is currently the most commonly used. Basically

Electrical measuring instruments: Quantities of electrical current, voltage and resistance are measured using instruments called meters. Until the advent of electronic displays

in water equivalent how the temperature or water and solid equal?

How to determine the co efficient of viscosity of liquid by capillary flow method?

What is hall Effect? Derive an expression for it.

A crown glass prism has refractive indices 1.575 and 1.585 for blue and red colours. Determine its dispersive power. What are the basic conditions for a pair of thin prisms to p