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Term (Index) Definition
MODFET,  Modulation Doping Field Effect Transistor; type of heterojunction FET;built on the modulation doping principle; capable of operating at very low temperatures; typically formed by combination of AlGaAs and GaAs epitaxial layers.
modulation doping,  doping of a heterostructure (e.g. AlGaAs-GaAs) implemented in such way that the resulting free electrons are spatially separated from the positive donor ions; as a result scattering of moving electrons on the dopant atoms is avoided; aslo, due to the separation, electrons remain free and mobile even at the very low temperatures; MODFET is a transistor built on the modulation doping principle.
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