Multilayer Porous Polymer Films for High‐Performance Stretchable Organic Electrochemical Transistors

Porous films offer a general and simple strategy for balancing the electron/hole transport, ion doping/dedoping process in organic electrochemical transistor (OECT) channel. Here universal 3D integrated approach that simultaneously achieves both enhanced transconductance (gm) mechanical stretchability via constructing multilayer breath-figured porous polymer channel by poly(3-hexylthiophene) (P3HT)/ polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) poly(2,5-bis(3-triethyleneglycoloxythiophen-2-yl)-co-thiophene) (Pg2T-T)/SEBS mixture is demonstrated. The formed elastic structure provides efficient tunable ionic-electronic coupling transport pathways, while also introducing immunity toward tensile deformation. Remarkably, an obvious increase gm [from 10.05 mS (2.13 mS) to 29.23 (7.38 Pg2T-T (P3HT)] acquired assembling OECT from single layer trilayer. Moreover, as high 40% 60% P3HT, obtained with >21% retained. Furthermore, gms (9.34 0.92 respectively) are maintained after 600 stretching cycles (20% 30% strains respectively). Overall, effective enhance electrical performance OECTs, well opens possibilities other electronics where large surface-to-volume ratio needed.