05 - Density Of States

05 - Density Of States - EECS 320 Density Of States...

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EECS 320 Density Of States J. Phillips EECS 320 Electronic states Start with a piece of semiconductor material How would you define the number of electron states? Recall: Pauli Exclusion Principle
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J. Phillips EECS 320 Electronic states Electron states distributed in energy Electron states are not uniformly distributed in energy Semiconductor Valence band filled with electrons Core electrons valence electrons Conduction band E vac Energy Bandgap We are primarily concerned with states near E C and E V J. Phillips EECS 320 States In Conduction/Valence Band Recall Conduction and Valence Band E C E V E No states in the bandgap Define “hole” states in valence band Define electron states in conduction band Number of states Unit volume x Unit energy Density Of States = (Note we have 4-D, 3-D in space + energy)
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J. Phillips EECS 320 Density Of States Density of states may be determined if bandstructure is known E G p=0 E Conduction Band Valence Band p E C E V Near bandedge (E C and E V ), approximate using effective
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05 - Density Of States - EECS 320 Density Of States...

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