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O: Fachverband Oberflächenphysik
O 50: Poster Organic Molecules on Inorganic Substrates: Adsorption and Growth
O 50.7: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
Structure and thermal Stability of (C60+P2O) and (C60+P4O) Heterolayers on Ag(111) — •Mohammed Suhail Ansari, Ravi Priya, Keda Jin, and Peter Jakob — Department of Physics, Philipps-Universität Marburg, Germany
This study investigates the interactions between C60 fullerene and two organic semiconductors, 6,13-pentacenequinone (P2O) and 5,7,12,14-pentacenetetrone (P4O), on Ag(111) substrates using IRAS, SPA-LEED, and TDS. The aim is to elucidate the structural properties and transformation processes of C60 and P2O/P4O under varying preparation conditions and thermal processing. Our findings reveal three different vertical arrangement scenarios of the heterostructures based on the deposition sequence and thermal treatments: (a) Formation of a well-defined bilayer on a pre-deposited monolayer corresponding to the deposition sequence, (b) a complete interlayer exchange of molecules, and (c) a partial interlayer exchange leading to mixed layers. Scenario (a) is observed with a P2O bilayer deposited on a well-defined C60 monolayer. Interestingly, P2O adsorbs in an inclined orientation on the C60/Ag(111) monolayer. Scenario (b) is observed with deposition of a monolayer of P2O followed by a bilayer of C60 at room temperature that results in P2O migration to the second layer, emphasizing the weaker interaction of P2O with the substrate Scenario (c) is found for the combination of C60 and P4O and it involves migration of P4O to the second layer if it was deposited in the first layer, and vice-versa. We will discuss in detail the evolution of the grown heterolayers in terms of molecular orientations, interlayer exchange, and intermixing.
Keywords: C60 fullerene; Pentacene derivatives; Heterostructures; Interlayer interactions; Infrared Absorption Spectroscopy (IRAS),