Room-Temperature Electrocaloric Effect in Layered Ferroelectric CuInP<sub>2</sub>S<sub>6</sub> for Solid-State Refrigeration.
basic_science · Level V
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- Record sourced from PubMed, PMID 31374166.
- Also identified by DOI 10.1021/acsnano.9b01491.
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Abstract
A material with reversible temperature change capability under an external electric field, known as the electrocaloric effect (ECE), has long been considered as a promising solid-state cooling solution. However, electrocaloric (EC) performance of EC materials generally is not sufficiently high for real cooling applications. As a result, exploring EC materials with high performance is of great interest and importance. Here, we report on the ECE of ferroelectric materials with van der Waals layered structure (CuInP<sub>2</sub>S<sub>6</sub> or CIPS in this work in particular). Over 60% polarization charge change is observed within a temperature change of only 10 K at Curie temperature. Large adiabatic temperature change (|Δ<i>T</i>|) of 3.3 K and isothermal entropy change (|Δ<i>S</i>|) of 5.8 J kg<sup>-1</sup> K<sup>-1</sup> at |Δ<i>E</i>| = 142.0 kV cm<sup>-1</sup> and at 315 K (above and near room temperature) are achieved, with a large EC strength (|Δ<i>T</i>|/|Δ<i>E</i>|) of 29.5 mK cm kV<sup>-1</sup>. The ECE of CIPS is also investigated theoretically by numerical simulation, and a further EC performance projection is provided.