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03 - Effective mass, doping, DOS

03 - Effective mass, doping, DOS - Energy bands effective...

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Energy bands, effective mass, doping, density of states What are intrinsic and doped semiconductors? What type of impurities can be dopants for Si? What are the energy levels of the dopant atoms? What is “n” the number of electrons (or “p”, number of holes) able to provide current flow? What is the number of available electron (hole) states in a semiconductor? How are charge carriers distributed in energy?
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Covalent Bonding in a Crystal
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Conduction and Valence Bands Valence electrons define conductivity Semiconductor Valence band filled with electrons Core electrons valence electrons Conduction band E vac Energy Bandgap Metal Valence partially filled with electrons valence electrons Conduction band E vac
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Energy band formation due to interaction of valence electrons between neighboring atoms When a discrete energy level broadens into an energy band, the valence electrons are not associated with single atoms anymore
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