Field Effect (semiconductor), Gating
Field effect may refer to: relative influence of electricity to the substrate within a given field. * Field effect (chemistry), an effect that a pole (either an unipole or dipole) has on a remote reaction centre (reaction rates, equilibrium). This effect operates through space not through bonds which distinguishes it from the inductive effect. * Field effect (semiconductor), the physical mechanism modulating the conductivity of a semiconductor using an applied voltage difference. * Field effect also known as field cancerization, a field of molecular and cellular changes in normal appearing tissue, which predispose to the development of cancer. * Wien effect The Wien effect is the experimentally observed increase in ionic mobility or conductivity of electrolytes at very high gradient of electrical potential. A theoretical explanation has been proposed by Lars Onsager. A related phenomenon is known as ...

Field Effect (chemistry)
A field effect is the chemical polarity, polarization of a molecule through space. The effect is a result of an electric field produced by Electric charge, charge localization in a molecule. This field, which is substituent and Conformational isomerism, conformation dependent, can influence structure and reactivity by manipulating the location of electron density in bonds and/or the overall molecule. The polarization of a molecule through its bonds is a separate phenomenon known as Inductive effect, induction. Field effects are relatively weak, and diminish rapidly with distance, but have still been found to alter molecular properties such as acidity. Field sources Field effects can arise from the Electric dipole moment, electric dipole field of a bond containing an Electronegativity, electronegative atom or electron-withdrawing substituent, as well as from an atom or substituent bearing a formal charge. The directionality of a dipole, and concentration of charge, can both define ...
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