Lecture Notes_3-4_Carriers_Ef_2014

See discussions next we fill energy states with

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Unformatted text preview: expect the higher the current is going to be. Electron concentration in the conduction band is an integral of the electron distribution function n(E), which is equal to the product of density of states and probability function that an electron occupy a particular energy state at E. See discussions next. We fill energy states with electrons from the bottom (lowest energy). At zero Kelvin, the electrons fill up to an energy level, Fermi level. At finite temperature T, some electrons near the Fermi level can enough thermal energy to occupy higher- energy states. The probability function changes from a step function at 0 K to Fermi- Dirac distribution function as shown. If we deal with energy levels at E such that E – EF is greater than 3 kT, we can...
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