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

Determine vout and the power supplied, Q. An operational amplifier stage is...

Q. An operational amplifier stage is typically represented by the circuit of Figure. For the values given, determine V out and the power supplied by the 2.5-V source.

Illustrate procedure of hex to binary conversion, Q. Illustrate procedure o...

Q. Illustrate procedure of Hex to Binary Conversion? It is also simple to convert from an integer hex number to binary. This is achieved by: Convert the Hex number t

Cellular telecommunication sector - software defined radio, Cellular teleco...

Cellular telecommunication sector - Software Defined Radio As of now, every cell phone transmits and receives information through a speci?c standard. If we have to change the s

Transparent latch d flip flop, Transparent latch D flip  Flop A typica...

Transparent latch D flip  Flop A typical  example  of this  type of D flop  is 7475 shown  in figure when CLK  connected is enable signal is high and the flip  flop  is enabled

Control system, model reference adaptive controller for interacting coupled...

model reference adaptive controller for interacting coupled tank

Transfer characteristics of jfets, Q. Give the Shockley's equation for the ...

Q. Give the Shockley's equation for the transfer characteristics of JFET's? Where ID is the drain current and VGS is the voltage across gate and source. The squared term o

3 phase 4 wire meters, 3 Phase 4 Wire Meters 3-phase 4 wire meters (10...

3 Phase 4 Wire Meters 3-phase 4 wire meters (10/20, 20/50 A) are used for agricultural and industrial consumers. For loads up to 50 A, the meters are directly linked to the su

Find the net force experienced by a positive charge, Q. Two charges of equa...

Q. Two charges of equal magnitude 5µC but opposite sign are separated by a distance of 10 m. Find the net force experienced by a positive charge q = 2 µC that is placed midway betw

Why two rectifier is used in smps, Its not essential that a power plant use...

Its not essential that a power plant uses only two rectifiers, it depends on the load there at the site and the capacity of the rectifier or SMPS. Assume the load at the site is 12

Determine self inductance of coil, Determine self inductance of coil: ...

Determine self inductance of coil: A flux of 0.5 m Wb is generated by coil A of 600 turns wound on a ring with a current of 2 A in it. Determine (a) self inductance of coil A,

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