Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 51: 2D Materials: Stacking and heterostructures (joint session O/HL/TT)

HL 51.3: Vortrag

Freitag, 13. März 2026, 10:00–10:15, HSZ/0401

Kirkendall Voids in Monolayer Mo_xTa_yS₂ Alloys on Au(111) — Kai Mehlich¹, Thais Chagas¹, Francis H. Davies^2,3, Alessia Bardazzi¹, Catherine Grover¹, Arkady V. Krasheninnikov³, and •Carsten Busse¹ — ¹Department Physik, Universität Siegen, Walter-Flex-Straße 3, 57072 Siegen, Germany — ²Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany — ³Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, EX4 4QL United Kingdom

During the growth of monolayer MoS₂-TaS₂ heterostructures, we observe the Kirkendall effect: Diffusing vacancies agglomerate in MoS₂, forming what are commonly termed Kirkendall voids - here manifesting as holes in the 2D layer. This phenomenon has not been previously reported in systems with reduced dimensionality.

We prepare the lateral heterostructures by reactive molecular beam epitaxy on chemically inert and weakly interacting Au(111). First, compact MoS₂ cores are grown. In a second step, TaS₂ is added in a sulfur-rich environment at elevated temperatures which promotes diffusion at the interface. The resulting heterostructures exhibit characteristic 2D Kirkendall holes surrounded by a Mo_xTa_yS₂ alloy region. These findings reveal defect-mediated processes in low-dimensional systems and open new avenues for designing 2D lateral heterostructures with intricate morphologies.

Keywords: lateral heterostructures; diffusion; TMDC; epitaxy; STM