Wang Yuning, Qu Yipu, Xu Yu, Li Didi, Lu Zhengqian, Li Jianjie, Su Xujun, Wang Guobin, Shi Lin, Zeng Xionghui, Wang Jianfeng, Cao Bing, Xu Ke
School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui230026, China.
Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu215123, China.
ACS Nano. 2023 Feb 28;17(4):4023-4033. doi: 10.1021/acsnano.3c00026. Epub 2023 Feb 6.
Remote epitaxy (RE), substrate polarity can "penetrate" two-dimensional materials (2DMs) and act on the epi-layer, showing a prospective universal growth strategy. However, essentially, the role that 2DMs plays in RE has not been deeply investigated so far. Here, the RE of single-crystal films on the weakest polarity/iconicity substrate is realized to reveal its essence physical properties. Graphene facilitates attenuative charge transfer (ACT) from a substrate to epi-layer to construct remote interactions. Interfacial atoms are assembled into "incommensurate" epitaxial relationships through graphene to reduce misfit dislocations in the epi-layer. Moreover, graphene reduces the atomic migration barrier, leading to a tendency toward a "layer-by-layer" growth mode. Such film growth mode is different with the conventional epitaxy (CE), and it is beneficial for the fast growth of epi-layers and the reduction of dislocations at coalescence boundaries. The insightful revelation of the role of graphene reveals the interface physics of RE and provides a more valuable guide to using 2DMs to expand three-dimensional materials (3DMs) for application in devices.
远程外延（RE）中，衬底极性能够“穿透”二维材料（2DMs）并作用于外延层，展现出一种具有前景的通用生长策略。然而，从本质上讲，二维材料在远程外延中所起的作用至今尚未得到深入研究。在此，通过在最弱极性/离子性衬底上实现单晶薄膜的远程外延，以揭示其本质物理特性。石墨烯有助于从衬底到外延层的衰减电荷转移（ACT），从而构建远程相互作用。界面原子通过石墨烯组装成“失配”外延关系，以减少外延层中的失配位错。此外，石墨烯降低了原子迁移势垒，导致倾向于“逐层”生长模式。这种薄膜生长模式与传统外延（CE）不同，有利于外延层的快速生长以及合并边界处位错的减少。对石墨烯作用的深刻揭示揭示了远程外延的界面物理，并为利用二维材料扩展三维材料（3DMs）以应用于器件提供了更有价值的指导。
