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

Database management system, outline the three schema database architecture ...

outline the three schema database architecture clearly explaining each level and how the user view the information

Angle of elevation, If V is the initial speed of the ball at angle of ele...

If V is the initial speed of the ball at angle of elevation a , if the origin of the coordinate system is chosen to coincide with the propulsion device, then the initial conditi

All.., Ask question #Minimum 100thank you words accepted#

Ask question #Minimum 100thank you words accepted#

Christian maturity level , A researcher is interested in comparing the Chri...

A researcher is interested in comparing the Christian maturity level of students who volunteer for community service versus those who do not. The researcher suppose that those who

Fast fourier transform, From this point on it is assumed that any problem a...

From this point on it is assumed that any problem amenable to solution with the aid of the Discrete Fourier Transform (or DFT) will in fact be treated computationally with a fast r

Fourier Series, A function f(t) is defined as f(t) = p - t for 0 Write do...

A function f(t) is defined as f(t) = p - t for 0 Write down the even extension of f(t) for -p Determine the Fourier cosine series, and hence, calculate the Fourier series approx

Math models, As an engineering student, the ministry of energy and minerals...

As an engineering student, the ministry of energy and minerals has tasked you to help them model equation(s) that can estimate the amount of crude oil in a reservoir. The governmen

Calculate principal value of the root, Compute the (real and imaginary part...

Compute the (real and imaginary parts of the) principal value of the eighth root of (a + ib) to 3 decimal places (accurate to 10 -3 ). Call the real part "m 7 ", and the imagina

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