Chemical vapor deposition of layered two-dimensional MoSi<sub>2</sub>N<sub>4</sub> materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 32764066.
- Also identified by DOI 10.1126/science.abb7023.
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Abstract
Identifying two-dimensional layered materials in the monolayer limit has led to discoveries of numerous new phenomena and unusual properties. We introduced elemental silicon during chemical vapor deposition growth of nonlayered molybdenum nitride to passivate its surface, which enabled the growth of centimeter-scale monolayer films of MoSi<sub>2</sub>N<sub>4</sub> This monolayer was built up by septuple atomic layers of N-Si-N-Mo-N-Si-N, which can be viewed as a MoN<sub>2</sub> layer sandwiched between two Si-N bilayers. This material exhibited semiconducting behavior (bandgap ~1.94 electron volts), high strength (~66 gigapascals), and excellent ambient stability. Density functional theory calculations predict a large family of such monolayer structured two-dimensional layered materials, including semiconductors, metals, and magnetic half-metals.