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Abstract
The subthreshold characteristics of silicon MESFETs manufactured using both bulk silicon and silicon-on-sapphire (SOS) technology, have been studied. n- and p-type devices have been investigated and their characteristics are presented here. The results show that the subthreshold behaviour for bulk devices in fully comparable with that of MESFETs, while the SOS devices show a somewhat lower value of subthreshold swing. A comparison between calculated and experimental behaviour is presented which yields information about the influence of the geometry and processing parameters of the subthreshold behaviour. It is proposed that the saturation subthreshold current for bulk transistors can be decreased by a proper design. An improvement for SOS devices, however, requires improved substrate material.
Published Version
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