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

Explain procedure to test the power line, Explain procedure to take shut do...

Explain procedure to take shut down and to test the power line before starting work? Ans: Study the circuit and find out the circuit breaker to be opened. Open and lock the c

Which realization requires the least number of gates, Q. Consider a 1-bit v...

Q. Consider a 1-bit version of the digital comparator shown in Figure. Note that the operation of this circuit is such that whichever output is 1 gives the desired magnitude compar

CONTORL SYSTEMS, WHAT ABOUT THE STABILITY IF WE USE COMPENSATOR

WHAT ABOUT THE STABILITY IF WE USE COMPENSATOR

Vlsi, what is the difference between latch and flipflop

what is the difference between latch and flipflop

Describe the uses of GPS map, Describe the uses of GPS map This is far...

Describe the uses of GPS map This is far safer because a driver of a vehicle doesn't have to consult maps while driving. It also removes error (for example going the wrong way

Symmetrical fluctuating message, A symmetrical fluctuating message, with |f...

A symmetrical fluctuating message, with |f(t)| max = 6.3 V and KCR = 3, is to be encoded by using an encoder that employs an 8-bit natural binary code to encode 256 voltage levels

The parallel resistance rule, The Parallel Resistance rule ...

The Parallel Resistance rule Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Compute the mutual inductance, Compute the mutual inductance: A long s...

Compute the mutual inductance: A long single layer solenoid has an effective diameter of 10 cm and it is wound with 1000 turns/m. There is a small concentrated coil with its p

Hlt halt instruction , HLT Halt Instruction The microprocessor halts  ...

HLT Halt Instruction The microprocessor halts  the execution  of the  program and enters into  the wait  state  the address  and data bus are placed in the  high  impedance st

Application of plc - stepper motor , Application of PLC a. A PLC  is us...

Application of PLC a. A PLC  is used to start  and stop  the motors  of a segmented conveyor beli. This  allows  only belt section carrying  a copper plate to move. b.In aut

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