Large-area single-crystal sheets of borophene on Cu(111) surfaces

Wu, Rongting; Drozdov, Ilya K.; Eltinge, Stephen; Zahl, Percy; Ismail-Beigi, Sohrab; Božović, Ivan; Gozar, Adrian

doi:10.1038/s41565-018-0317-6

Title: Large-area single-crystal sheets of borophene on Cu(111) surfaces

Journal Article · 02 December 2018 · Nature Nanotechnology

DOI: https://doi.org/10.1038/s41565-018-0317-6 · OSTI ID:1489234

^[1]; Drozdov, Ilya K. ^[2]; Eltinge, Stephen ^[3]; Zahl, Percy ^[2];

^[3];

^[4];

^[5]

Yale Univ., New Haven, CT (United States); Yale Univ., West Haven, CT (United States); currently at Yale University (previously scientist at Brookhaven National Lab)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Yale Univ., New Haven, CT (United States)
Yale Univ., New Haven, CT (United States); Yale Univ., West Haven, CT (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Yale Univ., New Haven, CT (United States); Yale Univ., West Haven, CT (United States)

Borophene, a theoretically proposed two-dimensional (2D) boron allotrope has attracted much attention as a candidate material platform for high-speed, transparent and flexible electronics. It was recently synthesized, on Ag(111) substrates and studied by tunneling and electron spectroscopy. However, the exact crystal structure is still controversial, the nanometre-size single-crystal domains produced so far are too small for device fabrication and the structural tunability via substrate-dependent epitaxy is yet to be proven. We report on the synthesis of borophene monitored in situ by low-energy electron microscopy, diffraction and scanning tunnelling microscopy (STM) and modelled by ab initio theory. We resolved the crystal structure and phase diagram of borophene on Ag(111), but found that the domains remain nanoscale for all growth conditions. However, by growing borophene on Cu(111) surfaces, we obtained large single-crystal domains, up to 100 μm² in size. The crystal structure is a novel triangular network with a concentration of hexagonal vacancies of η = 1/5. Our experimental data, together with first principles calculations, indicate charge-transfer coupling to the substrate without significant covalent bonding. Lastly, our work sets the stage for fabricating borophene-based devices and substantiates the idea of borophene as a model for development of artificial 2D materials.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0012704

OSTI ID:: 1489234

Report Number(s):: BNL--210908-2019-JAAM; PII: 317

Journal Information:: Nature Nanotechnology, Journal Name: Nature Nanotechnology Journal Issue: 1 Vol. 14; ISSN 1748-3387

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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