Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 8: 2D Materials Beyond Graphene I

O 8.10: Talk

Monday, March 20, 2017, 12:45–13:00, REC/PHY C213

Investigation of 2D hBN after ion irradiation — •Lara Bröckers, Henry Bohnen, and Marika Schleberger — Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany

Ion irradiation is a useful tool for the controlled modification of two-dimensional (2D) materials. Previous experiments have revealed characteristic, structural modification of graphene and other 2D materials created by swift heavy ion (SHI) irradiation [1,2]. We could show that the size of these modification, called foldings, vary depending on the irradiation parameters. Typically, the foldings are 50-80 nm in width and more than a micron in length, depending on the angle of incidence of the ions and on the substrate [3]. The main channel for energy deposition in solids by SHIs is the excitation of the target electrons. Therefore, a comparison between 2D materials with different electronic properties can help to reveal the physical mechanisms of defect creation. Comparing the folding of graphene (semiconductor) with the folding of hBN (insulator) we found significant differences. We determine the so-called efficiency, i.e. the number of ions needed to create one folding one average. For graphene this number equals one only for single layer graphene, otherwise it decreases rapidly down to zero with increasing number of layers. In the case of hBN however, also thicker layers are folded with a high efficiency. In addition, we have studied how the efficiency is influenced by the substrate.

[1] Akcöltekin S. et al. Applied Physics Letters, 98 (2011) 103103

[2] Ochedowski O. et al. NimB, 340 (2014) 39.

[3] Ochedowski O. et al. Nanotechnology, 26 (2015) 465302