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O: Fachverband Oberflächenphysik

O 45: Organic molecules on inorganic substrates: Adsorption and growth – Poster

O 45.8: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

Decoupling of Organic Monolayers from Cu(111) Using Blue Phosphorene — •Felix Otto, Wiebke Makowski, Jonas Brandhoff, Maximilian Schaal, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany

Two-dimensional (2D) materials are promising for future electronics due to their tunable properties. Since graphene’s discovery in 2004, materials like MoS2, h-BN, and Blue Phosphorene (BlueP) have been synthesized, offering high charge mobility and adjustable band gaps. BlueP can be grown on substrates such as Cu(111), making it suitable for decoupling organic layers. This study investigates whether BlueP can effectively decouple PTCDA monolayers from Cu(111). Two BlueP phases – hexagonal and chiral – were prepared and characterized, revealing structures with hexagonal unit cells but significantly stretched lattices compared to free-standing BlueP. Despite structural differences, both phases exhibited similar chemical and electronic properties. PTCDA was deposited on both phases, forming ordered herringbone structures. On the chiral phase, a single structural model sufficed, while two were necessary for the hexagonal phase. Spectroscopic analyses indicated weak interactions and evidence of integer charge transfer, supporting the idea that BlueP acts as an effective decoupling layer. These findings contribute to understanding how 2D-materials can be used to electronically isolate organic monolayers, advancing their application in nanoelectronics.

Keywords: PTCDA; Blue Phosphorene; epitaxial growth; scanning tunneling microscopy; photoelectron spectroscopy