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Abstract
A transconductance (g <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf> ) of as high as 330 mS/mm is obtained from wafers grown by MO-CVD in which triethyl gallium and triethyl aluminum are used as organometallic compounds. A comparison between the experimental and theoretical results is made for the dependence of g <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf> on the thickness of the AlGaAs layer. The saturation of velocity of 2-DEG determined from the drain I-V characteristics is found to be as high as 2 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> cm/s regardless of the absence of the undoped spacer layer.
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