5.Thermal

5.Thermal - 1--Carrier concentrationsCarrier...

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Unformatted text preview: 1--Carrier concentrationsCarrier concentrations--Thermal equilibriumThermal equilibriumSections 3.3, 4.2, 4.3, 4.4, 4.5 of course text:1.Carrier concentrations2.Density of states3.Fermi-Dirac distribution function4.nand ni5.Hemi-Maxwellian distribution and mean velocity2Carrier concentrationsCarrier concentrationsWhat is this in 3-D?What is g(k) and what are its units?Use PBA for E-k,Assume spherical k-space3Filling up the statesFilling up the statesWe now know the density of statesWe mayalso know how many electrons and holes to put into these states.What is the probability of a given state being filled?We need a distribution function that describes the probability of a momentum state (e.g., kx) being occupied by no more than how many electrons?4Carrier concentrationsCarrier concentrationsWhat shall we use for f (E)?It is well known only in thermal equilibrium.or5FermiFermi--DiracDiracdistribution functiondistribution functionEFis the Fermi (energy) levelkBis Boltzmann's constant....
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5.Thermal - 1--Carrier concentrationsCarrier...

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