Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 12: 2D Materials I: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)

HL 12.11: Talk

Monday, March 16, 2020, 13:15–13:30, WIL C107

Neutralization of ions transmitted through graphene and MoS₂ monolayers — •Sascha Creutzburg^1,7, Janine Schwestka², Anna Niggas², Heena Inani³, Anthony George⁴, Lukas Madauß⁵, Stefan Facsko¹, Jani Kotakoski³, Marika Schleberger⁵, Andrey Turchanin⁴, Pedro L. Grande⁶, Friedrich Aumayr², and Richard A. Wilhelm^1,2 — ¹HZDR, Ion Beam Center, Dresden, Germany — ²TU Wien, Institute of Applied Physics, Vienna, Austria — ³University Vienna, Faculty of Physics, Vienna, Austria — ⁴Friedrich Schiller University Jena, Institute of Physical Chemistry, Germany — ⁵University Duisburg-Essen, Faculty of Physics and CENIDE, Germany — ⁶Federal University of Rio Grande do Sul, Porto Alegre, Brazil — ⁷TU Dresden, Germany

Ion irradiation is a widely used technique for material modification. The use of ion irradiation for defect engineering in 2D materials requires a high sensitivity of energy deposition in the surface during the ion’s impact. Ions of high charge states (e.g. Xe³⁰⁺) deposit their potential energy of up to tens of keV in shallow surface depths triggering nanostructure formation. In fact, nanostructure formation in 2D materials, like carbon nanomembranes or MoS₂, due to the impact of Xe ions of charge states larger than 28 was observed. In contrast, no nanostructures on graphene were found, even after irradiation with Xe⁴⁰⁺ ions. Here, we investigated the ion’s neutralization during the transmission through freestanding graphene and MoS₂ monolayers. We deduce the lost energy of the ions (kinetic and potential) in experiment and put our results into context of nanostructuring.