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Completed_Module_11_-_Electrical_Propert07

Completed_Module_11_-_Electrical_Propert07 - Module 11...

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Unformatted text preview: Module 11 Electrical Properties Band Structure in Solids (i) The valence band is the highest band that is normally filled with electrons, in particular those electrons which are in localized orbitals and participate in bonding. W (ii) energy states above the valence band are delocalized and comprise the conduction band. (iii) the separation in energy between the valence and conduction bands is the bandgap. Metals: Insulators Semiconductors (a) partiallyfilled conduction band or E > .34 eV 0 <5; < ~3-4 eV . . g g (b) overlapping valence & conduction bands E ' Ec: €919,113 a-fl Eff/6m £4? 04 (aneJMC‘LVtI— Lake. Q‘FC'EV Ev: (Mrw a; 49? («16,4 cf Uri/0"! [va’fiL Example: Crystalline silicon is the most prevalent & commercially important semiconductor. . Silicon has 4 valence electrons that are non-conducting in their normal valence orbitals. . an electron that is excited to the conduction band leaves behind an unfilled valence state with a net positive charge (hole) . Excitation requires absorption of energy. Sr Mal/1A.. /SZZSZZPL3S?392 35?3 h (or!) valUH—c w (Maj. §X(r'7lov‘/f¢h of ah {1((7‘VCH JG 4“ Fanc’uc‘luua game] rap. 060*" 53‘ . ~//wm,.x (”‘65 (127) //,///'O/’ i I E” ' “MW/’4'?” up 5‘ JDLMLW‘ ( Av) ...
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