Enhancing the Response Speed of Organic Electrochemical Transistors via Ion Liquid/Metal–Organic Framework-Embedded Semiconducting Polymers

Chao Hsien Hsu, Sin Rong Huang, Jen Yu Lai, Gu Hao Cai, Meng Dian Tsai, Chung Wei Kung, Jung Yao Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Organic electrochemical transistors (OECTs) are recognized for their ability to combine electronic and ionic transport in the channel, resulting in improved transconductance and reduced operation voltage compared to organic field-effect transistors (OFETs). Nevertheless, the hydrophobic nature of conjugated polymers remains a hindrance to ion drift, thereby causing slow switching speed and limiting their practical application. This study introduces the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][TFSI]) adsorbed in a metal–organic framework (MOF-525) as an ion reservoir within a conjugated polymer, for the first time, to serve as the active channel in OECTs. Due to shortened ionic drift time, in the poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (PBTTT-C14) system, the original polymer membrane without MOF-525/[EMIM][TFSI] exhibits a characteristic ON time (τON) of 28.75 s, whereas the PBTTT-C14/MOF-525/[EMIM][TFSI] composite film significantly reduces the τON to 2.56 s with ON/OFF current ratio of 102. Enhancing response speed through facile physical blending of MOF-525/[EMIM][TFSI] in conjugated polymer film can also be realized on flexible substrate and in poly(3-hexylthiophene-2,5-diyl) (P3HT) system which provide a general strategy to broaden the selection of conjugated polymers in accumulation mode OECTs.

Original languageEnglish
Article number2300645
JournalAdvanced Electronic Materials
Volume10
Issue number3
DOIs
Publication statusPublished - 2024 Mar

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

Fingerprint

Dive into the research topics of 'Enhancing the Response Speed of Organic Electrochemical Transistors via Ion Liquid/Metal–Organic Framework-Embedded Semiconducting Polymers'. Together they form a unique fingerprint.

Cite this