Publication date: 21st July 2025
Polarons exist when charges are injected into organic semiconductors due to their strong coupling with the lattice phonons (electron-phonon coupling), significantly affecting charge transport properties. Understanding the formation/ deformation and localization/ delocalization of polarons induced by ions is critical for development of organic electrochemical devices such as organic electrochemical transistors (OECTs) and organic synaptic transistors (OSTs). However, there have been only few studies reported in this area, lacking direct evidence on in situ polaron formation/ deformation and associated structural changes. In this talk, I will show our recent work in this area. First, how a minor modification of side chains (nature and density) in conjugated polymers affects the polaron formation /deformation via electrochemical doping, changing the polymers electrical properties. Second, how glycol sidechain length of conjugated polymers impact polaron formation, with the optimal length enabling a balance between ionic and electronic charge transport. Finally, I will show molecular structure dependent ion retention by tracking polaron-induced structural changes during OST operation. These results provide key experimental evidence and fundamental understanding of the strong electron-phonon coupling in molecular semiconductors and its impact on organic electrochemical devices.
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