POS2-1504
Standardisation of Gate‐Dependent Mobility Measurement Methods in Organic Electrochemical Transistors
Topic
S2. High-End Characterization/Polymer Physics/Properties
When and Where
Sep 29, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Youhyun Nam (Seoul National University)
Co-Author(s)
Abstract
Understanding the mechanisms governing electronic charge transport in organic mixed ionic electronic conductors (OMIECs) is essential for the rational design of materials for organic electrochemical transistors (OECTs), which are increasingly being explored for sensing, neuromorphic computing, and bioelectronic applications.1 A key aspect of this understanding is the dependence of electronic mobility on charge carrier density, expressed as gate dependent mobility (μOECT(VG)) in OECTs. However, reliable measurement of this property remains a significant challenge. Conventional methods based on transfer curve analysis are susceptible to error propagation arising from uncertainties in capacitance and film thickness, while techniques based on charge carrier transit time can be affected by Faradaic side reactions that compromise measurement accuracy.2
In this work, we present and validate two complementary measurement methods for accurate characterisation of μOECT(VG) using two complementary techniques, the gate dependent time of flight (GDToF) and the gate dependent impedance matching (GDIM) methods. By benchmarking μOECT(VG) values obtained from both approaches and examining the corresponding electrochemical behaviour using an equivalent circuit model, we establish practical guidelines and standard conditions for reliable characterisation of the electronic properties of OMIECs. More broadly, this study facilitates consistent reporting of gate-dependent transport characteristics, enabling more reliable material evaluation and contributing to a deeper understanding of structure–property relationships in OMIEC systems.
(1) Bryan D. Paulsen, Klas Tybrandt, Eleni Stavrinidou & Jonathan Rivnay, Nat. Mater., 2020, 19, 13–26.
(2) Youngseok Kim, Joost Kimpel, Alexander Giovannitti & Christian Müller, Nat. Commun., 2024, 15(1), 1-8.
In this work, we present and validate two complementary measurement methods for accurate characterisation of μOECT(VG) using two complementary techniques, the gate dependent time of flight (GDToF) and the gate dependent impedance matching (GDIM) methods. By benchmarking μOECT(VG) values obtained from both approaches and examining the corresponding electrochemical behaviour using an equivalent circuit model, we establish practical guidelines and standard conditions for reliable characterisation of the electronic properties of OMIECs. More broadly, this study facilitates consistent reporting of gate-dependent transport characteristics, enabling more reliable material evaluation and contributing to a deeper understanding of structure–property relationships in OMIEC systems.
(1) Bryan D. Paulsen, Klas Tybrandt, Eleni Stavrinidou & Jonathan Rivnay, Nat. Mater., 2020, 19, 13–26.
(2) Youngseok Kim, Joost Kimpel, Alexander Giovannitti & Christian Müller, Nat. Commun., 2024, 15(1), 1-8.
