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V FB = 1/q ( G - S ). (includes semiconductor and oxide components). (position of the Fermi level). (the amount of “band bending”). -. -. -. V FB = - V bi. EC (intrinsic). D Eg. EF. available impurity band states. filled impurity band states. EC (degenerate) ~ ED.
E N D
(includes semiconductor and oxide components) (position of the Fermi level) (the amount of “band bending”) - - - VFB= - Vbi
EC (intrinsic) DEg EF available impurity band states filled impurity band states EC (degenerate) ~ ED apparent band gap narrowing: DEg* (is optically measured) Eg* is the apparent band gap: an electron must gain energy Eg* = EF-EV EV - Degenerate Semiconductors As the doping conc. increases more, EF rises above EC
Quantum Effects on Threshold Voltage