Figure 1: Active material and structure of the transistor.
From: High transconductance organic electrochemical transistors

(a) Chemical structure of PEDOT and PSS. A hole, indicated as a positive polaron on the PEDOT chain, is compensated by a sulphonate ion on the PSS chain. (b) Schematic of an OECT cross-section and the wiring diagram for device operation. (c) Optical micrograph of an individual transistor. Scale bar, 10 μm.