ExtraNotesOnIntrinsicSemiconductors

ExtraNotesOnIntrinsicSemiconductors - UNIVERSITY OF...

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EMS 172 – Extra Notes on Semiconductors UNIVERSITY OF CALIFORNIA, DAVIS Department of Chemical Engineering and Materials Science EMS 172: Electronic, Magnetic, and Optical Properties of Materials Intrinsic Semiconductors - Pure semiconductors - Properties are determined from the intrinsic materials properties E Conduction band Valence band Bandgap Ev=0 Ec=Eg E Ev=0 Ec=Eg F(E) or 1 F(E) E F 1 E Z(E) N(E) E electrons (F(E)) holes (1 F(E)) High Temperature CB VB E ε =0 ε 0 E ε 0 becomes E Ev=0 Ec=Eg E Ev=0 Ec=Eg F(E) or 1 F(E) E F 1 E Z(E) N(E) E electrons (F(E)) holes (1 F(E)) Low Temperature
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EMS 172 – Extra Notes on Semiconductors Electrons move with the application of the electric field, ε . In the conduction band, we can follow the movement of the electrons to the right. Because there are few electrons and many empty spots, all the electrons are able to move. In the valence band, there are many electrons and few empty spots. Only the electrons next to a vacant spot (hole) are able to move under the
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This document was uploaded on 10/27/2011 for the course EMS 172 at UC Davis.

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ExtraNotesOnIntrinsicSemiconductors - UNIVERSITY OF...

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