Figure 4. Characterization of printed SWNT-channel and cutoff frequency of R2R gravure-printed SWNT-TFTs.
(a) Capacitances at accumulation and (b) channel charges of printed SWNT-TFTs with randomly selected samples under different channel lengths (30, 80, 130, 180, and 230 μm) on a 150 m length of PET web. (c) Layout of inverter circuit with load resistance to test the cutoff frequency of printed SWNT-TFTs. (d) Observed cutoff frequency of fully R2R gravure-printed SWNT-TFTs with high mobility by constructing an inverter with a resistor.