DataVXACS Applied Materials & InterfacesPaper
journal article·2021-07-14Open access

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

Baolin Zhao, Bastian Gothe, Arthur Groh, Thomas Schmaltz, Johannes Will, Hans-Georg Steinrück, Tobias Unruh, Stefan Mecking, Marcus Halik

ACS Applied Materials & Interfaces· Volume 13· Issue 27
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Source abstract

Abstract

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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Research context

Electronic materials

OpenAlex topics: Molecular Junctions and Nanostructures · Nanowire Synthesis and Applications · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Organic Materials & Devices, Institute of Polymer Materials, Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstraße 3, 91058 Erlangen, Germany

Chair of Chemical Materials Science, Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany

Institute of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratory of Macromolecular and Organic Materials, EPFL−STI−IMX−LMOM, Station 12, 1015 Lausanne, Switzerland

Crystallography and Structural Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 3, 91058 Erlangen, Germany

Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), IZNF, Cauerstraße 3, 91058 Erlangen, Germany

Department Chemie, Universität Paderborn, 33098 Paderborn, Germany

Funding

China Scholarship Council · Alexander von Humboldt-Stiftung · Deutsche Forschungsgemeinschaft · Cluster of Excellence ???Engineering of Advanced Materials??? · SFB 767 Controlled Nanosystems · Graduate School of Molecular Science (GSMS)

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