김연주 (서울대학교), Christian Nielsen (Queen Mary Unveristy of London), 강기훈 (서울대학교)
초록
내용
Organic electrochemical transistors (OECTs) are attractive candidates for biosensing applications due to their efficient ion-electron coupling, high transconductance, and operational stability in aqueous environments. However, the predominant use of polymer-based organic mixed ionic-electronic conductors (OMIECs) present inherent challenges, particularly regarding batch-to-batch variation and restricted molecular design versatility. In this context, organic small molecules stand out as promising candidates for OMIEC applications. Unlike their polymer counterparts, small molecules offer distinct advantages, characterized by their well-defined chemical structures and broad diversity in molecular engineering. Crucially, this allows for precise atomistic tailoring of the entire molecular architecture without the synthetic constraints of polymerization. This design freedom facilitates the fine-tuning of frontier molecular orbital energy levels and the facile incorporation of specific functional moieties to enhance ionic interactions, both of which are essential for optimizing mixed conduciton. In this study, we investigate the potential of these materials, demonstrating that n-type small molecule OMIECs exhibit robust device performance.