Electronic statesStart with a piece of semiconductor materialHow would you define the number of electron states?
Electronic statesElectron states distributed in energySemiconductorValence band filled with electronsCoreelectronsvalenceelectronsConduction bandEvacEnergy BandgapElectron states are not uniformly distributed in energyWe are primarily concerned with states near ECand EV
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States In Conduction/Valence BandRecall Conduction and Valence BandDefine electron states in conduction bandEECNo states in the bandgapEVDefine “hole” states in valence bandNumber of statesUnit volume x Unit energyDensity Of States =(Note we have 4-D, 3-D in space + energy)