Self-organized twist-heterostructures via aligned van der Waals epitaxy and solid-state transformations

Peter Sutter (), Rina Ibragimova, Hannu-Pekka Komsa, Bruce A. Parkinson and Eli Sutter
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Peter Sutter: University of Nebraska-Lincoln
Rina Ibragimova: Aalto University, P.O. Box 11100
Hannu-Pekka Komsa: Aalto University, P.O. Box 11100
Bruce A. Parkinson: University of Wyoming
Eli Sutter: University of Nebraska-Lincoln

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Vertical van der Waals (vdW) heterostructures of 2D crystals with defined interlayer twist are of interest for band-structure engineering via twist moiré superlattice potentials. To date, twist-heterostructures have been realized by micromechanical stacking. Direct synthesis is hindered by the tendency toward equilibrium stacking without interlayer twist. Here, we demonstrate that growing a 2D crystal with fixed azimuthal alignment to the substrate followed by transformation of this intermediate enables a potentially scalable synthesis of twisted heterostructures. Microscopy during growth of ultrathin orthorhombic SnS on trigonal SnS2 shows that vdW epitaxy yields azimuthal order even for non-isotypic 2D crystals. Excess sulfur drives a spontaneous transformation of the few-layer SnS to SnS2, whose orientation – rotated 30° against the underlying SnS2 crystal – is defined by the SnS intermediate rather than the substrate. Preferential nucleation of additional SnS on such twisted domains repeats the process, promising the realization of complex twisted stacks by bottom-up synthesis.

Date: 2019
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DOI: 10.1038/s41467-019-13488-5

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