Extended Data Fig. 8. Electrochemical impedance spectroscopy, transient response, and ion sensing using vOECT-based vertically stacked inverters.
a, EIS measurement setup of typical two-electrode along with the corresponding spectroscopies based on (b) gDPP-g2T:Cin-Cell(9:2) and (c) Homo-gDPP:Cin-Cell (9:2). d, Drain current transient responses of vOECTs with gDPP-g2T:Cin-Cell (9:2) thicknesses of 100 nm, 200 nm, 300 nm, 400 nm. VG is a square pulse between 0.0 and −0.5 V. e, Voltage output characteristics of the vOECT-based vertically stacked complementary inverter for ion sensing over a wide concentration range of KCl in water. f, Measured transition voltage as a function of KCl concentration. Sensitivities of 31 mV/dec (10−6 ~ 10−3 M) and 89 mV/dec (10−3 ~ 1 M) are obtained with linear approximation (dash line) of the measurements.