Electrical Conduction Notes

Electrical Conduction Notes - Chapter 10 Notes Electrical...

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Chapter 10 Notes – Electrical Properties 1. Electrical Conduction a. Types of Charge Carriers i. Electrons ii. Holes (missing electrons) iii. Cations iv. Anions 2. Resistivity (ohm-m) a. An intrinsic material property that describes the ability of a material to resist the transport of electrical charge in response to an external electric field b. Extrinsic – facilitated by impurities i. N-type semiconductor: a class of extrinsic semiconductors containing dopant atoms with more than four valence electrons; excess negative charge ii. P-type semiconductor: a class of extrinsic semiconductors containing dopant atoms with fewer than four valence electrons; excess positive charge c. Semiconductors (Si, Ge, ZnS, GaN, SiC, GaAs, GaP, InP) i. N increases with increasing temperature d. Metals i. N is a constant, q is a constant, μ proportional to 1/T e. Insulators i. N increases with increasing temperature, q varies according to the charge carrier 3. Conductivity ((ohm-m) -1 ) a. An intrinsic material property that describes the ease with which electric charge is transported through a material in response to an external electric field 4. Energy Band Diagrams a. Valence band energy (E v ): the highest-energy electron band that is at least partially filled at 0K
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Electrical Conduction Notes - Chapter 10 Notes Electrical...

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