Fermi dirac level, Electrical Engineering

Assignment Help:

Fermi Dirac level:

Sol. The Fermi level is simply a reference energy level. It is the energy level at which the probability of finding an electron n energy unit above it in the conduction band is equal to the probability of finding a hole n energy units below it in the valence band. Very simply, it can be considered to the average energy level of the electrons, as illustrated in fig. (a). For simplification let us assume that (i) widths of energy bands are  small in comparison to forbidden energy gap between them (ii) all levels in a band have the same energy, bandwidths being assumed to be small (iii) energies of all levels in valence band are E0, as shown in fig. (a) and (iv) energies of all levels in conduction band are EG. Let the zero energy reference level be taken arbitrarily at the top of the valence band, as shown in fig. (b). Now number of electrons in conduction band, where P represents the probability of an electron having energy EG. Its value may be determined from Fermi Dirac probability distribution function given as where P (E) is the probability of finding an electron having any particular value of energy E.


Related Discussions:- Fermi dirac level

Laws of magnetic induction, The observations from these experiments led to ...

The observations from these experiments led to 'The Laws of Electromagnetic Induction' 1)  'If the magnetic flux threading through an electrical circuit changes, then an e.m.f.

Use of capacitor in technical loss reduction, Use of Capacitor in Technical...

Use of Capacitor in Technical Loss Reduction The use of capacitors to correct for poor power factor is a well-built and cost-effective means of reducing distribution system lo

Not gate- introduction microprocessors , Normal 0 false fals...

Normal 0 false false false EN-IN X-NONE X-NONE

Mips simulator, The coursework requires you to work in pairs to write a Jav...

The coursework requires you to work in pairs to write a Java application that will take a numerical representation of a MIPS program and simulate its execution. MIPS is a Load-S

Discuss crp, Question 1 Explain the construction of telephone network ...

Question 1 Explain the construction of telephone network Question 2 What is out-of-band signaling? Explain Question 3 Describe STP (Signaling Transfer Point) Questio

Explain common emitter configuration, Q. Explain Common emitter configurati...

Q. Explain Common emitter configuration? Common emitter configuration: In this circuit the emitter is common to both input and the output.Such a configuration is also known as

LED, what ternary alloy, composition and binary substrate can be used for ...

what ternary alloy, composition and binary substrate can be used for an LED at 1.55 µm optical fiber windo

Write a short note on the working of darlington amplifier, Q. Write a sho...

Q. Write a short note on the working of Darlington Amplifier? A Darlington Amplifier is one that is employing the Darlington pair of transistors. It is a

Satellite Communication, ubmission Deadline: Wednesday, July 7, 2021 Assign...

ubmission Deadline: Wednesday, July 7, 2021 Assignment 2 EE5543 - Satellite Communication Question 1: MEASAT-1 is located at 91.5 o E and operating at the base frequency of 10.982

Electronics, why bypass capacitor is used

why bypass capacitor is used

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