Oligothiophene Phosphonic Acids for Self-Assembled Monolayer Field-Effect Transistors

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2021
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Zhao, Baolin
Gothe, Bastian
Schmaltz, Thomas
Will, Johannes
Steinrück, Hans-Georg
Unruh, Tobias
Halik, Marcus
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ACS Applied Materials & Interfaces. American Chemical Society (ACS). 2021, 13(27), pp. 32461-32466. ISSN 1944-8244. eISSN 1944-8252. Available under: doi: 10.1021/acsami.1c05764
Zusammenfassung

Semiconducting self-assembled monolayers (SAMs) represent highly relevant components for the fabrication of organic thin-film electronics because they enable the precise formation of active π-conjugates in terms of orientation and layer thickness. In this work, we demonstrate self-assembled monolayer field-effect transistors (SAMFETs) composed of phosphonic acid oligomers of 3-hexylthiophene (oligothiophenes-OT) with systematic variations of thiophene repeating units (5, 10, and 20). The devices exhibit stable lateral charge transport with increased mobility as a function of thiophene unit counts. Importantly, our work reveals the packing and intermolecular order of varied-chain-length SAMs at the molecular scale via X-ray reflectivity (XRR) and quantitative X-ray photoelectron spectroscopy (XPS). Short oligomers (OT5-PA and OT10-PA) arrange almost perpendicular to the substrate, forming highly ordered SAMs, whereas the long-chain OT20-PA exhibits a folded structure. By tuning the molecular order in the monolayers via the SAM substitution reaction, the OT20-PA devices show a tripling in mobility.

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540 Chemie
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SAMFETs structure−property charge transport self-assembly semiconducting oligomer
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ISO 690ZHAO, Baolin, Bastian GOTHE, Arthur GROH, Thomas SCHMALTZ, Johannes WILL, Hans-Georg STEINRÜCK, Tobias UNRUH, Stefan MECKING, Marcus HALIK, 2021. Oligothiophene Phosphonic Acids for Self-Assembled Monolayer Field-Effect Transistors. In: ACS Applied Materials & Interfaces. American Chemical Society (ACS). 2021, 13(27), pp. 32461-32466. ISSN 1944-8244. eISSN 1944-8252. Available under: doi: 10.1021/acsami.1c05764
BibTex
@article{Zhao2021-07-14Oligo-54471,
  year={2021},
  doi={10.1021/acsami.1c05764},
  title={Oligothiophene Phosphonic Acids for Self-Assembled Monolayer Field-Effect Transistors},
  number={27},
  volume={13},
  issn={1944-8244},
  journal={ACS Applied Materials & Interfaces},
  pages={32461--32466},
  author={Zhao, Baolin and Gothe, Bastian and Groh, Arthur and Schmaltz, Thomas and Will, Johannes and Steinrück, Hans-Georg and Unruh, Tobias and Mecking, Stefan and Halik, Marcus}
}
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