Giant Pyroelectric Figure of Merits in Strain-Engineered Ferroelectric 2D-SnSe Layered Nanosheets: An Efficient Transient Thermal Energy Harvester.
basic_science · Level V
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- Record sourced from PubMed, PMID 40353774.
- Also identified by DOI 10.1021/acsnano.5c03458.
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Abstract
Two-dimensional (2D) layered semiconductors reveal boundless potential in next-generation ferro-, piezo-, and pyroelectric property-based self-powered devices. In this scenario, we report the experimental observations, which are consistent with the first-principles calculations of the out-of-plane ferro- and piezoelectricity in 2D tin selenide (SnSe) of van der Waals-bonded monolayers. It has a strain-engineered, synergetic trigonal crystal structure. Thin 2D-SnSe nanosheets of a few monolayers are exfoliated from bulk orthorhombic SnSe, which facilitates enormous potential of out-of-plane pyroelectric-aided transient thermal energy harvesting. In particular, phase and amplitude hysteresis of piezoresponse force microscopy affirms that the van der Waals-bonded trilayer SnSe nanosheets exhibit profound ferro- and piezoelectric (d<sub>33</sub> ∼ 3.45 pm/V) responses. A robust pyroelectric response persists with a figure of merit (<i>F</i><sub><i>v</i></sub> ∼ 8 m<sup>2</sup> C<sup>-1</sup> and <i>F</i><sub>D</sub> ∼ 132 × 10<sup>-6</sup> Pa<sup>-1/2</sup>), an order higher than the commercially benchmark bulk pyroelectrics. Hence, 2D-SnSe layers could be promising materials for pyroelectric-based waste heat scavenging, infrared imaging, and detectors for various applications.