摘要
最近,通过将外延生长的多层二维晶畴进行无缝拼接,研究人员成功实现了晶圆级单晶二维多层材料的合成.不同于以往观察到的类似婚礼蛋糕或倒置婚礼蛋糕结构,这些多层二维晶畴中所有层都具有完全相同的尺寸和形状,即多层同步生长.基于此,本文通过理论计算探索了多层二维材料的不同生长模式,提出了多层同步生长的物理模型,揭示了基底上液体异质表面层的形成是保证同步生长的关键性因素.作者指出在生长过程中,多层二维材料嵌入在衬底的异质表面层中,同时底层与固态基底直接接触.异质层能有效钝化二维材料的边缘,从而防止这些活性边缘的融合,而异质层与基底之间的高界面则迫使不同层的二维材料边缘保持同步生长.通过对多层同步生长机理的深入了解,本文揭示了发生多层同步生长的条件,为合成层数可控的晶圆级单晶二维材料提供了新的思路.
Recent efforts in growing two-dimensional(2D)multilayers have enabled the synthesis of single crystalline 2D multilayers in a wafer scale through the seamless stitching of multiple epitaxial 2D islands.Unlike previously observed wedding-cake or inverted-wedding-cake structures,these multilayer islands have the same size and shape in each layer with aligned edges.In this study,we investigated the underlying growth mechanisms of synchronic 2D multilayers growth and have showed that a heterogenous layer on a crystalline substrate is critical for maintaining the synchronic growth of 2D multilayers.During growth,the heterogenous layer passivates the edges of multilayer 2D island and thus prevents the coalescence of these active edges,while the high interfacial energy between the heterogenous surface layer and the substrate stabilizes the synchronic structure.Based on this model,we have successfully explained the previously observed synchronic growth of graphene and hexagonal boron nitride multilayers(Nat Nanotech 2020,15:861;Nature 2022,606:88).The deep understanding on the mechanism paves a way towards the synthesis of wafer-scale single-crystal 2D multilayers with a uniform thickness.
作者
张磊宁
孔潇
董际臣
丁峰
Leining Zhang;Xiao Kong;Jichen Dong;Feng Ding(Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications,MOE Key Laboratory of Cluster Science,School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 100081,China;State Key Laboratory of Information Functional Materials,2020 X-Lab,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China;Beijing National Laboratory for Molecular Sciences,Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China)
基金
supported by the Teli Fellowship from Beijing Institute of Technology
the National Natural Science Foundation of China(52303366,22173109,and 22333005)
High-Talent Grant(SIAT-SE3G0991010,2023)
Startup Grant from Shenzhen Institute of Advanced Technology。
