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Backgating measurements made on GaAs MESFETs with abrupt, graded alloy and graded superlattice interface AlGaAs buffer layers were compared to measurements made on conventional GaAs buffer-layer MESFETs. Only the superlattice interface structure showed a reduction in the backgating transconductance (by a factor of 24 compared to the GaAs buffer-layer FET). The lack of reduction in the backgating transconductance...
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