Properties of semi-conductors, Physics

Their conductivity lies between conductor and insulator. Their resistivity is usually high and temperature coefficient of resistance is always negative. These are materials which are having filled energy bands and small forbidden zones. Moving carriers of electric current are originated due to absorption of thermal radiant or electric energy from external source. At low temperature they become dielectrics. They present a rise in conductivity with rise in temperature because of increase in current carriers and vice-versa. These are materials whose valance electrons are bonded somewhat loosely to their atoms. They require energy less then insulators and more than good conductors to remove an electron from their parent atom. They own a vacant conduction band. Approximately filled valance band. Very low energy gap of 1.2ev separating the two bands.

Posted Date: 7/7/2012 8:53:58 AM | Location : United States







Related Discussions:- Properties of semi-conductors, Assignment Help, Ask Question on Properties of semi-conductors, Get Answer, Expert's Help, Properties of semi-conductors Discussions

Write discussion on Properties of semi-conductors
Your posts are moderated
Related Questions
Q. If a single force acts on an object, the object accelerates. yse it is definately true. Newton's second law.

BULK TECHNOLOGIES: THE bulk technologies are often known as wafer-based manufacturing. In other words in each of these approaches self-supporting wafers between 180 to 240 micro

Is low attenuation is a sign of good quality fibers? Usually yes low attenuation is a sign of good quality fibers, but within lighting fiber optics the manufacturer's attenua

Show that the displacement current flowing between the two plaes of the capacitor is similar to the conduction current utilized in charging the capacitor.


Physical arrangement of resistors: Before we look at some problems it is necessary to warn you that physical appearances can be deceptive. When components are mounted they are

1) Clean coal technology describes new electricity generation processes that are expected to have high efficiencies, be able to minimise environmental impacts, including SO 2 , NOx

Component Addition of vector We learned in which vectors oriented at right angles to one another could be added together by using the Pythagorean Theorem. For example, two disp

The beam below is supported at A and B.  F1 and F2 in kN are given in P21 and P22 respectively.  F3 in kN is given in P23 and the couple in kN.m is given in P24.  Assume that F1, F

Nortan'sTheorem can be stated as follows: Any two-terminal active network having voltage source and resistances when viewed from its output terminals is equal to a constant-curren