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Robust epitaxial growth of two-dimensional heterostructures, multiheterostructures, and superlattices

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Science  25 Aug 2017:
Vol. 357, Issue 6353, pp. 788-792
DOI: 10.1126/science.aan6814

Cycling 2D crystal growth

The electronic and optical properties of two-dimensional (2D) transitional metal dichalcogenides such as MoS2 and WSe2 could be modulated by creating in-plane superlattices and heterostructures from these materials. However, single layers of these materials are fragile and often do not withstand the processing conditions needed during subsequent growth steps. Zhang et al. developed a reverse-flow reactor that avoids thermal degradation and unwanted crystal nucleation. They demonstrate several examples of block-by-block epitaxial growth, such as 2D heterostructures where MoS2 surrounds a WS2 core and superlattices where the composition alternates between WS2 and WSe2.

Science, this issue p. 788