Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: 2D Materials Beyond Graphene: Growth, Structure and Substrate Interaction (joint session O/HL)
O 14.9: Vortrag
Montag, 17. März 2025, 17:00–17:15, H11
Kinetics of borophene growth on Ir(111) via boron segregation from the bulk — •Marin Petrović1, Sherif Kamal1, Borna Radatović1, Marko Kralj1, Matteo Jugovac2, Iulia Cojocariu2, Andrea Locatelli2, and Tevfik Onur Menteş2 — 1Centre for Advanced Laser Techniques, Institute of Physics, 10000 Zagreb, Croatia — 2Elettra - Sincrotrone Trieste S.C.p.A, 34149 Trieste, Italy
Segregation of boron atoms to the Ir(111) surface and their self-assembly into a borophene monolayer were tracked by low-energy electron microscopy (LEEM). Real-time monitoring of sample temperature, boron adatom concentration and borophene coverage reveals the kinetics of boron segregation from the iridium bulk and different modalities of borophene epitaxial growth. It is found that the temperature-triggered boron segregation to the surface is accompanied by instantaneous nucleation of borophene islands and condensation of boron adatoms, followed by rapid propagation of island perimeter along the iridium terraces. Subsequent growth of borophene proceeds by displacement of iridium surface steps, which is energetically expensive and thus relatively slow process that heavily depends on the step morphology. By identifying and analyzing quasi-equilibrium conditions on the sample surface during borophene growth, formation enthalpy of a boron monomer from borophene was estimated, which agrees well with the available theoretical calculations of the boron-iridium system.
Keywords: borophene; iridium; segregation; LEEM