Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 38: Organic Molecules on Inorganic Substrates II: Electronic Properties and Charge Transfer

O 38.6: Vortrag

Dienstag, 2. April 2019, 15:15–15:30, H24

Using self-assembled monolayers for controlling charge-carrier injection into organic transistors — Andreas Petritz¹, Markus Krammer², Eric Sauter³, Michael Gärtner⁴, Giulia Nascimbeni², Andreea Cojocaru¹, Esther Karner-Petritz¹, Roland Resel², Andreas Terfort⁴, Michael Zharnikov³, Karin Zojer², Barbara Stadlober¹, and •Egbert Zojer² — ¹Joanneum Research, MATERIALS-Institute for Surface Technologies and Photonics, Austria — ²Institute of Solid State Physics, Graz University of Technology, Austria — ³Applied Physical Chemistry, Heidelberg University, Germany — ⁴Institut für Anorganische und Analytische Chemie, Goethe-University Frankfurt, Germany

We show how self-assembled monolayers (SAMs) bearing embedded polar groups can be used for tuning contact resistances in organic thin-film transistors by three orders of magnitude.[1] The chosen approach also allows the realization of flexible p- and n-type transistors using Au electrodes.[1] An in-depth surface science investigation of the SAMs and the organic layers grown on top of them [1,2,3] show that the tunability of the contact resistance is a consequence of SAM-induced work function changes. Additionally, the dependence of tunneling transport through the SAMs on their chemical structure plays an important role.[1,4] The experimental results are rationalized by density-functional theory calculations. [1] A. Petritz et al., Adv. Funct. Mater., 1804462 (2018). [2] M. Gärtner et al., J. Phys. Chem. C, published on-line [3] T. Abu-Husein et al., Adv. Funct. Mater. 25, 3943 (2015). [4] A. Kovalchuk et al., Chem. Sci. 7, 781 (2016)