An Improved Cut-Off Frequency Model With a Modified Small-Signal Equivalent Circuit in Graphene Field-Effect Transistors


An improved cut-off frequency model of a modified equivalent circuit of graphene field-result transistors, which incorporates the extra capacitive effect physically gift thanks to dipole layer between the metal and also the graphene, is proposed. The original equivalent circuit isn't correct for a massive separation distance dipole layer. Based on the improved equivalent circuit model, a additional correct parameter extraction by two-port analysis is possible, and the cut-off frequency will be additional accurate notably for largely separated dipole layer close to the Dirac point. Considering the dipole layer, the equivalent circuit isn't investigated before, and the cut-off frequency model shows smart agreement with experiments.

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