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Cross-plane transport in a single-molecule two-dimensional van der Waals heterojunction

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The cross-plane charge transport is demonstrated in single-molecule two-dimensional van der Waals heterojunctions. Two-dimensional van der Waals heterojunctions (2D-vdWHs) stacked from atomically thick 2D materials are predicted to be a… Click to show full abstract

The cross-plane charge transport is demonstrated in single-molecule two-dimensional van der Waals heterojunctions. Two-dimensional van der Waals heterojunctions (2D-vdWHs) stacked from atomically thick 2D materials are predicted to be a diverse class of electronic materials with unique electronic properties. These properties can be further tuned by sandwiching monolayers of planar organic molecules between 2D materials to form molecular 2D-vdWHs (M-2D-vdWHs), in which electricity flows in a cross-plane way from one 2D layer to the other via a single molecular layer. Using a newly developed cross-plane break junction technique, combined with density functional theory calculations, we show that M-2D-vdWHs can be created and that cross-plane charge transport can be tuned by incorporating guest molecules. The M-2D-vdWHs exhibit distinct cross-plane charge transport signatures, which differ from those of molecules undergoing in-plane charge transport.

Keywords: cross plane; dimensional van; transport; two dimensional; plane

Journal Title: Science Advances
Year Published: 2020

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