Surface-confined two-dimensional mass transport and crystal growth on monolayer materials
Surface-confined two-dimensional mass transport and crystal growth on monolayer materials
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DOI：
10.1038/s44160-023-00442-z
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发表时间：
2023-07
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通讯作者：
Yanyu Jia;Fang Yuan;G. Cheng;Yue Tang;Guo Yu;Tiancheng Song;Pengjie Wang;R. Singha;Ayelet J. Uzan-Narovlansky;Michael Onyszczak;Kenji Watanabe;T. Taniguchi;N. Yao;L. Schoop;Sanfeng Wu
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作者：
Yanyu Jia;Fang Yuan;G. Cheng;Yue Tang;Guo Yu;Tiancheng Song;Pengjie Wang;R. Singha;Ayelet J. Uzan-Narovlansky;Michael Onyszczak;Kenji Watanabe;T. Taniguchi;N. Yao;L. Schoop;Sanfeng Wu
二维（2D）材料和异质结构的常规气相沉积或外延生长在大腔室中进行，在所述大腔室中质量从源传输到衬底。在这里，我们报告了一个无室，芯片上的方法，直接在纳米级表面限制的二维空间生长二维晶体结构。该方法是基于一个令人惊讶的发现的快速，长距离，非菲克传输的原子级薄钯的单层晶体的二碲化钨在温度远低于已知的熔点的所有材料。当单层种子是独立的或完全封装在货车德瓦尔斯堆中时，纳米限制生长实现了稳定的2D晶体材料Pd 7WTe 2的受控形成。该方法是可推广的，与纳米器件制造兼容，有望大大扩展2D材料库及其功能。
Conventional vapour 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 2D crystalline structures directly in a nanoscale surface-confined 2D space. The method is based on the surprising discovery of the rapid, long-distance, non-Fickian transport of a uniform layer of atomically thin palladium on a monolayer crystal of tungsten ditelluride at temperatures well below the known melting points of all the materials involved. The nanoconfined growth realizes the controlled formation of a stable 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 compatible with nanodevice fabrication, promising to greatly expand the library of 2D materials and their functionalities.