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

Zhao B, Gothe B, Groh A, Schmaltz T, Will J, Steinrueck HG, Unruh T, Mecking S, Halik M (2021)

Publication Type: Journal article

Publication year: 2021

Journal

ACS Applied Materials and Interfaces American Chemical Society

Book Volume: 13

Pages Range: 32461-32466

Journal Issue: 27

DOI: 10.1021/acsami.1c05764

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 it-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.

Authors with CRIS profile

Baolin Zhao Professur für Werkstoffwissenschaften (Polymerwerkstoffe) Bastian Gothe Professur für Werkstoffwissenschaften (Polymerwerkstoffe) Johannes Will Lehrstuhl für Kristallographie und Strukturphysik Tobias Unruh Professur für Nanomaterialcharakterisierung (Streumethoden) Marcus Halik Professur für Werkstoffwissenschaften (Polymerwerkstoffe)

Additional Organisation(s)

Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

Involved external institutions

Universität Konstanz DE Germany (DE) École Polytechnique Fédérale de Lausanne (EPFL) CH Switzerland (CH) Universität Paderborn DE Germany (DE)

How to cite

APA:

Zhao, B., Gothe, B., Groh, A., Schmaltz, T., Will, J., Steinrueck, H.-G.,... Halik, M. (2021). Oligothiophene Phosphonic Acids for Self-Assembled Monolayer Field-Effect Transistors. ACS Applied Materials and Interfaces, 13(27), 32461-32466. https://doi.org/10.1021/acsami.1c05764

MLA:

Zhao, Baolin, et al. "Oligothiophene Phosphonic Acids for Self-Assembled Monolayer Field-Effect Transistors." ACS Applied Materials and Interfaces 13.27 (2021): 32461-32466.

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