High-performance diketopyrrolopyrrole-based organic field-effect transistors for flexible gas sensors

We demonstrate high-performance flexible polymer OFETs with P-29-DPP-SVS in various geometries. The mobilities of TG/BC OFETs are approximately 3.48 +/- 0.93 cm(2)/V s on a glass substrate and 2.98 +/- 0.19 cm(2)/V s on a PEN substrate. The flexible P-29-DPP-SVS OFETs exhibit excellent ambient and mechanical stabilities under a continuous bending stress of 1200 times at an R = 8.3 mm. In particular, the variation of mu(FET), V-Th and leakage current was very negligible (below 10%) after continuous bending stress. The BG/TC P-29-DPP-SVS OFETs on a PEN substrate applies to flexible NH3 gas sensors. As the concentration of NH3 increased, the channel resistance of P-29-DPP-SVS OFETs increased approximately 100 times from similar to 10(7) to similar to 10(9) Omega at V-SD = -5 V and V-GS = -5 V. (C) 2015 Elsevier B.V. All rights reserved.