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Title: Novel Pd2Se3 Two-Dimensional Phase Driven by Interlayer Fusion in Layered PdSe2
Authors: Lin, Junhao
Zuluaga, Sebastian
Yu, Peng
Liu, Zheng
Pantelides, Sokrates T.
Suenaga, Kazu
Keywords: Two Dimensional (2D)
Layered Structures
Issue Date: 2017
Source: Lin, J., Zuluaga, S., Yu, P., Liu, Z., Pantelides, S. T., & Suenaga, K. (2017). Novel Pd2Se3 Two-Dimensional Phase Driven by Interlayer Fusion in Layered PdSe2. Physical Review Letters, 119(1), 016101-.
Series/Report no.: Physical Review Letters
Abstract: Two-dimensional (2D) materials are easily fabricated when their bulk form has a layered structure. The monolayer form in layered transition-metal dichalcogenides is typically the same as a single layer of the bulk material. However, PdSe2 presents a puzzle. Its monolayer form has been theoretically shown to be stable, but there have been no reports that monolayer PdSe2 has been abricated. Here, combining atomic-scale imaging in a scanning transmission electron microscope and density functional theory, we demonstrate that the preferred monolayer form of this material amounts to a melding of two bulk monolayers accompanied by the emission of Se atoms so that the resulting stoichiometry is Pd2Se3. We further verify the interlayer melding mechanism by creating Se vacancies in situ in the layered PdSe2 matrix using electron irradiation. The discovery that strong interlayer interactions can be induced by defects and lead to the formation of new 2D materials opens a new venue for the exploration of defect engineering and novel 2D structures.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.119.016101
Schools: School of Electrical and Electronic Engineering 
School of Materials Science & Engineering 
Research Centres: Centre for Programmable Materials 
Nanoelectronics Centre of Excellence 
Rights: © 2017 American Physical Society (APS). This paper was published in Physical Review Letters and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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