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

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 (CuInP2S6 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 (|ΔT|) of 3.3 K, isothermal entropy change (|ΔS|) of 5.8 J kg-1 K-1 at |ΔE|=142.0 kV cm-1 at 315 K (above and near room temperature) are achieved, with a large EC strength (|ΔT|/|ΔE|) of 29.5 mK cm kV-1. The ECE of CIPS is also investigated theoretically by numerical simulation and a further EC performance projection is provided.

32 pages, 10 figures

References in corpus (3)

• Giant electrocaloric effect in thin film Pb Zr_0.95 Ti_0.05 O_3
• Out-of-plane Piezoelectricity and Ferroelectricity in Layered $\alpha$-In2Se3 Nano-flakes
• Giant electrocaloric effect in the thin film relaxor ferroelectric 0.9 PbMg_(1/3)Nb_(2/3)O_3 - 0.1 PbTiO_3 near room temperature

Cited by in corpus (8)

• Highly tunable lateral homojunction formed in 2D layered CuInP2S6 via in-plane ionic migration
• Ionic control over ferroelectricity in 2D layered van der Waals capacitors
• Vibrational properties of CuInP2S6 across the ferroelectric transition
• Unconventional ferroelectric domain switching dynamics in CuInP2S6 from first principles
• Unique features of polarization in ferroelectric ionic conductors
• Electric field driven flat bands: Enhanced magnetoelectric and electrocaloric effects in frustrated quantum magnets
• To switch or not to switch -- a machine learning approach for ferroelectricity
• Van der Waals Layered Ferroelectric CuInP2S6: Physical Properties and Device Applications