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arXiv · 2307.06477

Surface-Confined Two-Dimensional Crystal Growth on a Monolayer

Yanyu Jia·Fang Yuan·Guangming Cheng·Yue Tang·Guo Yu·Tiancheng Song·Pengjie Wang·Ratnadwip Singha·Ayelet July Uzan·Michael Onyszczak·Kenji Watanabe·Takashi Taniguchi·Nan Yao·Leslie M Schoop·Sanfeng Wu
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Abstract

Conventional vapor deposition or epitaxial growth of two-dimensional (2D) materials and heterostructures is conducted in a large chamber in which masses transport from the source to the substrate. Here we report a chamber-free, on-chip approach for growing a 2D crystalline structures directly in a nanoscale surface-confined 2D space. The method is based on a surprising discovery of a rapid, long-distance, non-Fickian transport of a uniform layer of atomically thin palladium (Pd) on a monolayer crystal of tungsten ditelluride (WTe2), at temperatures well below the known melting points of all materials involved. The resulting nanoconfined growth realizes a controlled formation of a stable new 2D crystalline material, Pd7WTe2 , when the monolayer seed is either free-standing or fully encapsulated in a van der Waals stack. The approach is generalizable and highly compatible with nanodevice fabrication, promising to expand the library of 2D materials and their functionalities.

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Yanyu Jia, Fang Yuan, Guangming Cheng, Yue Tang, Guo Yu, Tiancheng Song, Pengjie Wang, Ratnadwip Singha, Ayelet July Uzan, Michael Onyszczak, Kenji Watanabe, Takashi Taniguchi, Nan Yao, Leslie M Schoop, Sanfeng Wu. 2023-07-12. Surface-Confined Two-Dimensional Crystal Growth on a Monolayer. https://doi.org/10.1038/s44160-023-00442-z

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