Abstract
The sidegating effect measurements on ungated FETs verify that the Schottky contact on undoped substrates causes serious current reduction in GaAs devices and high leakage current in the semi-insulating GaAs. By realizing the fact that current in Schottky-i-n structures can be high and taking this effect into account, the observed abrupt changes and S-shaped characteristics of the drain and sidegate currents can be explained to be the consequence of the transition of the substrate current from the n-i-n current to the Schottky-i-n current.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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