11-13-Lecture

11-13-Lecture - 1 Electrical Properties ENGR 213 ELECTRICAL...

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Unformatted text preview: 1 Electrical Properties ENGR 213 ELECTRICAL PROPERTIES - 1 response to electric field resistance (R) resistivity ( ) units ohm-m = -m IR V = l AR = ELECTRICAL PROPERTIES - 2 electrical conductivity ( ) units ( m)-1 = mho/m = S/m conductors [10 7 ( m)-1 ] semiconductors [10-6 to 10 4 ( m)-1 ] insulators [10-20 to 10-10 ( m)-1 ] 1 = Electrical Energy Transport - 1 motion of electrically charged particles free electrons holes (+e) - vacancies where electrons were ions es scattered by imperfections impurity, vacancy, interstitial, dislocation, vibration scattering reduces mobility Electrical Energy Transport - 2 total conduction depends on number of holes & electrons the amounts of charge they carry how mobile they are n and p metals: n >> p semicons: n ~ p h e e p e n + = Electron Energy Band Structure - 1 single atom has well-defined shell energy levels, e.g., 2s, 4p, 6f nearby atoms affect levels of valence electrons levels split into bands Electron Energy Band Structure - 2 valence band conduction band e- excitation = f (E g , T, impurity, defects) energy band gap (E g ) Electron Energy Band Structure - 3...
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This note was uploaded on 03/26/2008 for the course ENGR 213 taught by Professor Dr.stubbs during the Fall '04 term at Texas A&M.

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11-13-Lecture - 1 Electrical Properties ENGR 213 ELECTRICAL...

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