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


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.

SUBMITTER: Sutter P 

PROVIDER: S-EPMC6893034 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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

Sutter Peter P   Ibragimova Rina R   Komsa Hannu-Pekka HP   Parkinson Bruce A BA   Sutter Eli E  

Nature communications 20191204 1


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  ...[more]

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