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journal article·2022-04Open access

Dative Epitaxy of Commensurate Monocrystalline Covalent van der Waals Moiré Supercrystal

Mengying Bian, Liang Zhu, Xiao Wang, Junho Choi, Rajesh V. Chopdekar, Sichen Wei, Lishu Wu, Chang Huai, Austin Marga, Qishuo Yang, Yuguang C. Li, Fei Yao, Ting Yu, Scott A. Crooker, Xuemei M. Cheng, Renat F. Sabirianov, Shengbai Zhang, Junhao Lin, Yanglong Hou, Hao Zeng

Advanced Materials· Volume 34· Issue 17
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Source abstract

Abstract

Abstract Realizing van der Waals (vdW) epitaxy in the 1980s represents a breakthrough that circumvents the stringent lattice matching and processing compatibility requirements in conventional covalent heteroepitaxy. However, due to the weak vdW interactions, there is little control over film qualities by the substrate. Typically, discrete domains with a spread of misorientation angles are formed, limiting the applicability of vdW epitaxy. Here, the epitaxial growth of monocrystalline, covalent Cr5Te8 2D crystals on monolayer vdW WSe2 by chemical vapor deposition is reported, driven by interfacial dative bond formation. The lattice of Cr5Te8, with a lateral dimension of a few tens of micrometers, is fully commensurate with that of WSe2 via 3 × 3 (Cr5Te8)/7 × 7 (WSe2) supercell matching, forming a single‐crystalline moiré superlattice. This work establishes a conceptually distinct paradigm of thin‐film epitaxy, termed “dative epitaxy”, which takes full advantage of covalent epitaxy with chemical bonding for fixing the atomic registry and crystal orientation, while circumventing its stringent lattice matching and processing compatibility requirements; conversely, it ensures the full flexibility of vdW epitaxy, while avoiding its poor orientation control. Cr5Te8 2D crystals grown by dative epitaxy exhibit square magnetic hysteresis, suggesting minimized interfacial defects that can serve as pinning sites.
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Research context

Materials processing

OpenAlex topics: 2D Materials and Applications · Advanced Thermoelectric Materials and Devices · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing Key Laboratory for Magnetoelectric Materials and Devices Beijing Innovation Center for Engineering Science and Advanced Technology School of Materials Science and Engineering Peking University Beijing 100871 China

Department of Physics University at Buffalo State University of New York Buffalo NY 14260 USA

Department of Physics and Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen 518055 China

Physics Department Bryn Mawr College Bryn Mawr PA 19010 USA

National High Magnetic Field Laboratory Los Alamos National Laboratory Los Alamos NM 87545 USA

Advanced Light Source Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Department of Materials Design and Innovation University at Buffalo The State University of New York Buffalo NY 14260 USA

Division of Physics & Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

Department of Chemistry University at Buffalo The State University of New York Buffalo NY 14260 USA

Department of Physics University of Nebraska–Omaha Omaha NE 68182 USA

Department of Physics Rensselaer Polytechnic Institute Troy NY 12180 USA

Funding

National Natural Science Foundation of China · China Postdoctoral Science Foundation · National Science Foundation · Science, Technology and Innovation Commission of Shenzhen Municipality

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