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) Three charges, every equal to 1 micro coulomb, are placed at the three corners of a square of side 1 m. Find the electric field at the fourth corner. b) Determine the electri

What are the advantages of fibers optics? Glass fiber optics are extremely resilient and ideally fine for working in places where the actual conductor will tend to extreme temp

Does CPH mass increase? Answer; Never, mass of CPH is constant, as like its speed.

A step-up transformer has a primary coil having of 152 turns and a secondary coil with 3040 turns. The primary coil receives a peak voltage of 98 V. a. What is the effectiv

An object with a mass of 5 kilograms is a distance of 5 meters above the surface of the earth.  If the acceleration because of gravity is 10 meters per second squared, the pote

Q. What is cut-off or stopping potential? The minimum negative (retarding) potential specified to the anode for which the photo electric current becomes zero is called the cut

Define Electric Circuits So far we have only looked at electric charges sitting still and static discharges (like a shock or lightning). When we count on the charges moving thr


A charge is said to be in equilibrium, if total force performing on it is zero. A operation of charges is said to be in equilibrium if every charge is independently is equilibrium.

How can light be defined in simplest form? The common explanation of 'light' (visible) is electromagnetic radiation visible to the human eye. It is only a little part of wha