SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 105: Poster Session VIII: Graphene and beyond II
O 105.8: Poster
Donnerstag, 4. März 2021, 13:30–15:30, P
Single-domain h-BN monolayer growth on an incommensurable surface: Pt(110) — •Dominik Steiner1, Marco Thaler1, Florian Mittendorfer2, and Erminald Bertel1 — 1Institute of Physical Chemistry, University of Innsbruck, Innsbruck, Austria — 2Institute of Applied Physics and Center of Computational Material Science, University of Technology, Vienna, Austria
Lattice matching has been widely considered to be a prerequisite for perfect epitaxial growth. In contrast, we demonstrate by LEED, STM and DFT calculations large-scale, single-domain hexagonal Boron Nitride (h-BN) growth on the incommensurable Pt(110) surface [1]. In a competition between the h-BN and the Pt bulk geometry the former dominates the arrangement of the Pt(110) surface atoms. This adaptivity of the Pt(110) surface is key to the perfect film growth.
STM and LEED studies show that single-domain growth occurs only above a threshold temperature of ~1120 K. At T<1120 K, a defective multi-domain film on a rough Pt-surface is obtained. Referring to the results of Lee et al. for h-BN growth on liquid Au [2] we proposed that the Pt surface atoms form a quasi-liquid layer above the threshold temperature, thus enabling the alignment of h-BN nuclei. Our recent studies of the growth mechanism, however, indicate a more complex mechanism leading to single-domain growth.
[1] Steiner et al., ACS Nano 2019, 13 (6), 7083-7090.
[2] Lee at al., Science 2018, 362 (6416), 817.