Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 70: 2D Materials Beyond Graphene III

O 70.8: Talk

Wednesday, March 22, 2017, 12:15–12:30, WIL A317

Insights into structure and binding of micron-sized hexagonal boron nitride islands on Ir(111) — •Marin Petrović, Michael Horn-von Hoegen, and Frank-J. Meyer zu Heringdorf — Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany

Single-layer hexagonal boron nitride (hBN) islands have been synthesized on Ir(111) via chemical vapor deposition (CVD) of borazine at various temperatures. By using low-energy electron microscopy (LEEM) as the main experimental tool, two types of hBN islands were identified which differ in their shape (triangular and trapezoidal) and in their rotational registry with respect to the iridium. Moreover, photoemission electron microscopy (PEEM) and IV-LEEM spectroscopy measurements show that the two island types exhibit different work functions and interaction strengths with iridium, which is proposed to be the origin of their divergence in shape and growth modes. In addition, it is found that for CVD synthesis above ≈950 ^∘C additional boron islands are formed on the iridium surface, which is a result of increased decomposition of hBN and significant solubility of boron in iridium at high temperatures.