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

• Published in: Organic electronics Vol. 23; pp. 76 - 81
• Main Authors: Ryu, Gi-Seong, Park, Kwang Hun, Park, Won-Tae, Kim, Yun-Hi, Noh, Yong-Young
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2015
• Subjects: Conjugated polymer; Diketopyrrolopyrrole; Flexible organic transistors; Gas sensor; Organic field effect transistors; Conjugated polymer; Organic field effect transistors; Gas sensor; Diketopyrrolopyrrole; Flexible organic transistors
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2015.04.001

[Display omitted] •DPP-based OFETs are fabricated on a PEN substrate for flexible gas sensor applications.•Flexible P-29-DPP-SVS OFETs show an impressive mobility of 2.98±0.19cm2/Vs.•Reliable NH3 gas sensing is observed with high ambient and bending stabilities. 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±0.93cm2/Vs on a glass substrate and 2.98±0.19cm2/Vs 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=8.3mm. In particular, the variation of μFET, VTh 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 ∼107 to ∼109Ω at VSD=−5V and VGS=−5V.