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

Area of Science:

• Materials Science
• Solid-State Physics
• Thermodynamics

Background:

• The electrocaloric effect (ECE) offers potential for solid-state cooling, but material performance often limits practical applications.
• Developing high-performance electrocaloric (EC) materials is crucial for advancing cooling technologies.

Purpose of the Study:

• To investigate the ECE in van der Waals layered ferroelectric materials.
• To evaluate the potential of CuInP2S6 (CIPS) for efficient solid-state cooling.

Main Methods:

• Experimental characterization of the ECE in CIPS.
• Observation of polarization charge change near the Curie temperature.
• Numerical simulation for theoretical investigation and performance projection.

Main Results:

• CIPS exhibited over 60% polarization change within a 10 K temperature range at its Curie temperature.
• Achieved a large adiabatic temperature change (ΔT) of 3.3 K and isothermal entropy change (ΔS) of 5.8 J kg⁻¹ K⁻¹ at 315 K.
• Reported a high EC strength of 29.5 mK cm kV⁻¹.

Conclusions:

• CIPS demonstrates significant electrocaloric properties, making it a promising candidate for next-generation solid-state cooling.
• The findings highlight the potential of van der Waals layered ferroelectrics for high-performance EC applications.