SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: 2D Materials V: Growth, Structure and Substrate Interaction (joint session O/CPP)

CPP 40.3: Talk

Wednesday, March 29, 2023, 15:30–15:45, GER 37

Transition from fractal-dendritic to compact islands for the 2D-ferroelectric SnSe on graphene/Ir(111) — Paulus Aleksa, Sammer Iqbal, Muhammad Ali Martuza, Jiaqi Cai, Thais Chagas, Robin Ohmann, and •Carsten Busse — Universität Siegen, Germany

Monolayer islands of the 2D-ferroelectric SnSe have been grown by MBE under UHV conditions using inert and weakly interacting graphene on Ir(111) as the substrate. After deposition at room temperature, fractal-dendritic islands are observed in STM. The preferential growth directions are aligned with high-symmetry directions of the substrate. Upon annealing the islands become more compact. At 560 K they exhbit their equilibrium shape, higher temperatures lead to desoprtion. The equilibrium shape cannot be simply explained by minimization of the number of unsaturated bonds around the perimeter of an island with given area. The model has to be extended to incorporate the polar character of SnSe, leading to island edges that are charged in dependence of their orientation.