Technische Universität Dresden

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Research data repository of Dresden University of Technology.

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Browsing Technische Universität Dresden by Subject "3::32"

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    Open Access
    Bistable Organic Electrochemical Transistors: Enthalpy vs. Entropy
    (Technische Universität Dresden, 2024-07-03) Bongartz, Lukas
    Organic electrochemical transistors (OECTs) serve as the foundation for a wide range of emerging applications, from bioelectronic implants and smart sensor systems to neuromorphic computing. Their ascent originates from a distinctive switching mechanism based on the coupling of electronic and ionic charge carriers, which gives rise to a multitude of unique characteristics. Notably, various OECT systems have been reported with significant hysteresis in their transfer curve. While being a feature sought after as non-volatile memory in neuromorphic systems, no universal explanation has yet been given for its physical origin, impeding its advanced implementation. Herein, we present a thermodynamic framework that readily elucidates the emergence of bistable OECT operation through the interplay of enthalpy and entropy. We validate our model through three experimental approaches, covering temperature-resolved characterizations, targeted material manipulation, and thermal imaging. In this context, we demonstrate the exceptional scenario where the subthreshold swing deviates from Boltzmann statistics, and we provide an alternate view on existing data in literature, which further supports our model. Finally, we leverage the bistability in form of a single-OECT Schmitt trigger, thus compacting the complexity of a multi-component circuit into a single device. These insights offer a revised understanding of OECT physics and promote their application in non-conventional computing, where symmetry-breaking phenomena are pivotal to unlock novel paradigms.
  • Item
    Open Access
    STM data thiophene switch
    (Technische Universität Dresden, 2024-09-23) Moresco, Francesca
    Supplementary raw data to the publication “Adsorption and reversible conformational change of a thiophene based molecule on Au(111)" S. Sarkar, K. H. Au-Yeung, T. Kühne, A. Waentig, D-A. Ryndyk, T. Heine, G. Cuniberti, X. Feng, F. Moresco Scientific Reports 13, 10627 (2023) https://doi.org/10.1038/s41598-023-37661-5