Explain how conduction takes place in semiconductors, Engineering Mathematics

Assignment Help:

With the help of energy bands explain how conduction takes place in semiconductors.

Semiconductors: Substances as carbon, germanium and silicon that electrical conductivity lies in among the conductors and insulators are termed as semiconductors. The valence band of such substances is approximately filled, but the conduction band is approximately empty. The forbidden energy gap between valence and conduction band is very small (1ev) as shown in figure. Thus comparatively a smaller electric field is needed to push the valence electrons to the conduction band. It is the reason, why these materials under ordinary conditions do not conduct current and behaves as an insulator. Even though at room temperature, while some heat energy is imparted to the valence electrons, some of them cross over to the conduction band imparting minor conductivity to the semiconductors. Since the temperature is raised, more valence electrons cross over to conduction band and conductivity of the material raises. Therefore these materials have negative temperature co-efficient of resistance.

98_Semiconductors.png

Energy Band Diagrams


Related Discussions:- Explain how conduction takes place in semiconductors

Bad Illustration, There is an illustration of a diesel engine sixteen cylin...

There is an illustration of a diesel engine sixteen cylinder that is supposed to be four-cycle, however GM never made engines of that size that were not two-cycle. The four valves

Real and imaginary parts, What, to 3 decimal places, is the principal value...

What, to 3 decimal places, is the principal value of [a - ic] (b + id)/10 (real and imaginary parts)? Call the real part, and the imaginary part. Give one (any) other value of th

Lean manufacturing, Ask quassignment writing estion #Minimum 100 words acce...

Ask quassignment writing estion #Minimum 100 words accepted#

Research poll, A Pew Research poll was conducted to investigate opinions ab...

A Pew Research poll was conducted to investigate opinions about global warming.  The respondents who answered yes when asked if there is solid evidence that the earth is getting wa

Explain how conduction takes place in conductors, With the help of energy b...

With the help of energy bands explain how conduction takes place in conductors. On the basis of energy band materials are categorized as conductor is given below: Conducto

Maths, How to solve the problems

How to solve the problems

Modelling equations , how to model equations to determine the amount of oil...

how to model equations to determine the amount of oil in a reservior

MEAN VALUE THEORM, APPLICATIONS OF LAGRANGE''S MEAN VALUE THEORM?

APPLICATIONS OF LAGRANGE''S MEAN VALUE THEORM?

Diffusion equation, the solution of diffusion equation by using separation ...

the solution of diffusion equation by using separation of variables

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd