Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 16: Organic Thin Films, Organic-Inorganic Interfaces

DS 16.8: Talk

Wednesday, April 3, 2019, 11:30–11:45, H39

Low-Dimensional Hybrid Interfaces Between Acenes and TMDCs: Pentacene and Perfluoropentacene on MoS₂ — •Stefan Renato Kachel, Pierre Dombrowski, Tobias Breuer, Gregor Witte, and J. Michael Gottfried — Philipps-Universität Marburg, Germany

Pentacene (PEN) is a widely investigated organic semiconductor used for fabrication of thin film transistors. Upon fluorination, the electronic configuration of perfluoropentacene (PFP) undergoes drastic changes that influence its adsorption and growth behavior. The differences of PEN and PFP have been studied on bulk as well as on 2D layered MoS₂ by multiple techniques such as near-edge X-ray absorption fine structure (NEXAFS), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption (TPD) and optical spectroscopy. In NEXAFS, we found flat-laying monolayers of PEN and PFP on both bulk and 2D layers MoS₂. TPD shows a distinct monolayer peak characterized by a typical peak broadening and a peak maximum shift to lower temperatures as often found for organic adsorbates. Moreover, PFP submonolayers desorb at 30 K higher temperatures than PEN giving evidence for a higher binding energy to the substrate. The multilayer desorption is in agreement with other studies. Gentle heating allows the reliable desorption of the multilayers while leaving a well-defined monolayer behind, both on bulk as well as 2D-MoS₂. This preparation gives rise to further spectroscopic methods allowing the examination of the electronic properties of a perfectly defined interface between precisely one OSC layer and a 2D-TMDC substrate.