Here, the total device resistance formula_4 is plotted as a function of the channel length::formula_5where formula_6 and formula_7 are contact and channel resistancies, respectively, formula_8 is the channel length/width, formula_9 is gate insulator capacitance (per unit of area), formula_10 is carrier mobility, and formula_11 and formula_12 are gate-source and drain-source voltages.