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A material with reversible temperature change capability under an externalelectric field, known as the electrocaloric effect (ECE), has long beenconsidered as a promising solid-state cooling solution. However, electrocaloric(EC) performance of EC materials generally is not sufficiently high for realcooling applications. As a result, exploring EC materials with high performanceis of great interest and importance. Here, we report on the ECE offerroelectric materials with van der Waals layered structure (CuInP2S6 or CIPSin this work in particular). Over 60% polarization charge change is observedwithin a temperature change of only 10 K at Curie temperature. Large adiabatictemperature change (|{\Delta}T|) of 3.3 K, isothermal entropy change(|{\Delta}S|) of 5.8 J kg-1 K-1 at |{\Delta}E|=142.0 kV cm-1 at 315 K (aboveand near room temperature) are achieved, with a large EC strength(|{\Delta}T|/|{\Delta}E|) of 29.5 mK cm kV-1. The ECE of CIPS is alsoinvestigated theoretically by numerical simulation and a further EC performanceprojection is provided.

Room Temperature Electrocaloric Effect in Layered Ferroelectric CuInP2S6 for Solid State Refrigeration