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O: Fachverband Oberflächenphysik
O 75: Metal Substrates: Growth Studies
O 75.7: Vortrag
Mittwoch, 18. März 2020, 16:30–16:45, WIL C107
Epitaxy on (quasi-)liquid surfaces: A new paradigm for 2D materials growth? — •Dominik Steiner, Thomas Mairegger, and Erminald Bertel — Physikalische Chemie, Universität Innsbruck, Österreich
Lattice matching is usually an important consideration when choosing templates for epitaxial growth. Recently, Lee et al. achieved large-scale single-domain growth of hexagonal Boron Nitride (h-BN) on a liquid gold surface1. We obtained excellent single-domain growth of h-BN on Pt(110), despite the vastly different symmetries of D3h versus C2v. We observed a transition from growth conditions yielding a strongly perturbed multi-domain film on a rough substrate to single-domain growth on large terraces at a critical temperature of -0.9ex~1100 K2.
Intensity analysis of low-energy electron diffraction spots shows the hallmarks of a true phase transition suggesting a relation to the deconstruction or the roughening temperature of the clean Pt(110) surface3. Paradoxically, smooth, nearly perfect film growth is obtained only above the roughening temperature. The observations raise questions about the role of lattice matching in 2D crystal growth. Apparently, a high surface atom mobility of the template at growth conditions is superior to precise lattice matching in promoting 2D epitaxial growth.
1 Lee, J.S. et al., Science 362 , 817(2018).
2 Steiner, D., Mittendorfer, F., Bertel, E., ACS Nano 13 , 7083(2019).
3 Krzyzowski, M. A. et al., Phys. Rev. B 50 , 18505(1994).