Single-crystal hBN Monolayers from Aligned Hexagonal Islands

Junzhu Li, Abdus Samad, Yue Yuan, Qingxiao Wang, Mohamed Nejib Hedhili, Mario Lanza, Udo Schwingenschlögl, Iwnetim Abate, Deji Akinwande, Zheng Liu, Bo Tian () and Xixiang Zhang ()
Additional contact information
Junzhu Li: King Abdullah University of Science and Technology (KAUST)
Abdus Samad: King Abdullah University of Science and Technology (KAUST)
Yue Yuan: King Abdullah University of Science and Technology (KAUST)
Qingxiao Wang: King Abdullah University of Science and Technology (KAUST)
Mohamed Nejib Hedhili: King Abdullah University of Science and Technology (KAUST)
Mario Lanza: King Abdullah University of Science and Technology (KAUST)
Udo Schwingenschlögl: King Abdullah University of Science and Technology (KAUST)
Iwnetim Abate: Massachusetts Institute of Technology
Deji Akinwande: The University of Texas at Austin
Zheng Liu: 50 Nanyang Avenue
Bo Tian: 50 Nanyang Avenue
Xixiang Zhang: King Abdullah University of Science and Technology (KAUST)

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Hexagonal boron nitride (hBN), as one of the few two-dimensional insulators, holds strategic importance for advancing post-silicon electronic devices and circuits. Achieving wafer-scale, high-quality monolayer hBN is essential for its integration into the semiconductor industry. However, the physical mechanisms behind the chemical vapor deposition (CVD) synthesis of hBN are not yet well understood. Investigating morphology engineering is critical for developing scalable synthetic techniques for the large-scale production of high-quality hBN. In this study, we explored the underlying mechanisms of the CVD growth process of hBN and found that the involvement of a small amount of oxygen effectively modulates the shape of the single-crystal hBN islands. By tuning the oxygen content in the CVD system, we synthesized well-aligned hexagonal hBN islands and achieved a continuous, high-quality single-crystal monolayer hBN film through the merging of these hexagonal islands on conventional single-crystal metal-foil substrates. Density functional theory was used to study the edges of hBN monolayers grown in an oxygen-assisted environment, providing insights into the formation mechanism. This study opens new pathways for controlling the island shape of 2D materials and establishes a foundation for the industrial-scale production of high-quality, large-area, single-crystal hBN.

Date: 2024
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DOI: 10.1038/s41467-024-52944-9

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