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DS: Fachverband Dünne Schichten
DS 27: Organic Thin Films II
DS 27.5: Talk
Wednesday, April 2, 2014, 16:00–16:15, CHE 91
Order in functional self-assembled monolayers for transistor applications — •Thomas Schmaltz1, Hans-Georg Steinrück2, Artoem Khassanov1, and Marcus Halik1 — 1Organic Materials & Devices (OMD), University Erlangen- Nürnberg, Germany — 2Crystallography and Structural Physics, University Erlangen-Nürnberg, Germany
Self-assembled monolayers (SAMs) of functionalized molecules containing semiconducting moieties can be utilized to fabricate monolayer transistor devices (SAMFETs) by a simple, solution based process. However, the order in such systems is not always inherently as desired. For example, C60 functionalized alkylphosphonic acids (C60C18-PA) tend to arrange in a poor 2D order, but it can be increased by introducing alkyl-based monolayers in mixed SAMs as a supporting matrix [1]. In other systems, in which the size of the head group matches better to alkyl chain and anchor group, e.g. in (benzo[b]benzo[4,5]thieno[2,3-d]thiophene)-functionalized alkylphosphonic acids (BTBT-C12-PA), self-assembly of the pure molecules already yields highly ordered layers [2]. To obtain a deeper insight into the order of those monolayers, X-ray reflectivity and X-ray grazing incidence diffraction measurements on those SAMs were performed. Information from those analytical investigations is crucial to understand the relation between the chemical structure, the molecular order and electrical properties of those systems.
[1] C.M. Jaeger, T. Schmaltz et al., JACS, 135, 4893-4900 (2013).
[2] T. Schmaltz, A. Y. Amin et al., Adv Mater, 25, 4511-4514 (2013).