Fig. 1: Antiambipolarity in BBL and its modulation.
a, Structure of BBL. b, Structure of an OECT device. c, The antiambipolar behaviour in BBL resembles the activation and inactivation of sodium channels in a neuron. d–h, Modulation of the antiambipolar behaviour by electrical and chemical means, showing the effects of VDS dependence (d), different gate electrodes (e), ion concentration (f), ion type (g) and different amino acids/neurotransmitters (h). The OECT used in the comparison has a W/L = 40 µm/6 µm and 20-nm-thick BBL except for the higher-current NH4Cl device, which uses a wider channel (W/L = 400 µm/6 µm). A concentration of 100 mM is used for comparing various types of ions. Neurotransmitter and amino acid studies are carried out in 100 mM NaCl. The vertical dashed lines in d–h denote the gate voltage corresponding to the peak drain current (VP). The solid and dashed lines in h denote the forward and reverse scans.
