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O: Fachverband Oberflächenphysik
O 75: Poster Session VI: Organic molecules on inorganic substrates: electronic, optical and other properties II
O 75.4: Poster
Wednesday, March 3, 2021, 13:30–15:30, P
Decoupled or not decoupled? Investigation of charge transfer in organic/2D insulator/metal interfaces — •Maximilian Schaal1, Iliyan Karadzhov1, Takumi Aihara2, Marco Gruenewald1, Felix Otto1, Jari Domke1, Roman Forker1, Hiroyuki Yoshida2, and Torsten Fritz1 — 1Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany — 2Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
2D materials like hexagonal boron nitride (h-BN) are widely used as interlayer to decouple organic molecules from metallic surfaces. Nevertheless, there are also indications for a significant hybridization which results in a perturbation of the intrinsic molecular properties. This raises the question: what are the specific conditions under which an h-BN monolayer is sufficient to efficiently decouple organic molecules? In this work we deal with this question by comparing the electronic and optical properties as well as the lateral structure of about one monolayer 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA) and tetraphenyldibenzoperiflanthene (DBP) on h-BN/Ni(111). Therefore, we combined in situ differential reflectance spectroscopy, ultraviolet photoelectron spectroscopy, low energy electron diffraction and low temperature scanning tunnelling spectroscopy. Our results reveal that an integer charge transfer happens for PTCDA on h-BN/Ni(111). In contrast, the DBP molecules on h-BN/Ni(111) are well decoupled from the metal substrate, and no charge transfer occurs.