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HL: Fachverband Halbleiterphysik

HL 26: Poster 2D Materials Beyond Graphene: Growth, Structure and Substrate Interaction (joint session O/HL)

HL 26.3: Poster

Dienstag, 18. März 2025, 13:30–15:30, P3

Growth dynamics of 2D materials on Ir(111) — •Smruti Ranjan Mohanty, Marko Kriegel, Frank Meyer zu Heringdorf, and Michael Horn- von Hoegen — Faculty of Physics and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany

The structure and morphology of 2D materials are profoundly influenced by the choice of growth substrates, with noble metal substrates offering enhanced catalytic activity and complex surface morphology facilitating precise control over the growth of 2D materials. Employing low-energy electron microscopy (LEEM), we investigated the kinetics of graphene island nucleation during the CVD of ethylene on Ir(111) at growth temperatures ranging from 750°C to 1050°C for various dosing pressures. Graphene islands nucleate heterogeneously at Ir(111) step edges, leading to edge decorations, but a transition to homogeneous nucleation occurs at island densities lower than the step density. The strong variation in island density as a function of growth temperature and dosing pressure is explained by Venables nucleation theory, with the near-linear dependence on dosing pressure attributed to a critical nucleus size (i*) of 5. The work presented here also extends to the growth and characterization of other atomically thin 2D materials, including hexagonal boron nitride (hBN), and borophene on Ir(111). The investigation reveals complex growth mechanisms, the emergence of Moiré superlattices, and substrate-influenced interactions, providing insights for designing heterostructures and functional materials with significant potential for next-generation technological applications.

Keywords: Graphene; hBN; Borophene; Ir(111)