Ferroelectricity and piezoelectricity in monolayers and nanoplatelets of SnS

Abstract

The ground-state structure of monolayers and nanoplatelets of SnS with a thickness from two to five monolayers is calculated from first principles. It is shown that nanoobjects with only odd number of monolayers are ferroelectric. The ferroelectric, piezoelectric, and elastic properties of these polar structures are calculated. The appearance of polarization in these nanoobjects is explained by an uncompensated polarization that exists in an antiferroelectric structure of bulk SnS. The mechanism of ferroelectricity, in which the ferroelectric distortion is associated with short-range ordering of lone pairs, can be regarded as a way of creating ferroelectrics with high Curie temperature.

8 pages, 4 figures, 6 tables

References in corpus (1)

• Thermoelectric properties of orthorhombic group IV-VI monolayers from the first-principles calculations

Cited by in corpus (8)

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• Group-IV monochalcogenide monolayers: two-dimensional ferroelectrics with weak intra-layer bonds and a phosphorene-like monolayer dissociation energy
• Evolution of elastic moduli through a two-dimensional structural transformation
• Negative thermal expansion in CdSe quasi-two-dimensional nanoplatelets
• Spontaneous strain in quasi-two-dimensional Janus CdSe nanoplatelets and its microscopic mechanisms