期刊
ACS NANO
卷 13, 期 8, 页码 8760-8765出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b01491
关键词
CuInP2S6; ferroelectrics; electrocaloric effect; two-dimensional; room temperature
类别
资金
- Semiconductor Research Corporation (SRC)
- DARPA
- U.S. Office of Naval Research [N00014-16-1-2465]
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 (vertical bar Delta T vertical bar) of 3.3 K and isothermal entropy change (vertical bar Delta S vertical bar) of 5.8 J kg(-1) K-1 at vertical bar Delta E vertical bar = 142.0 kV cm(-1) and at 315 K (above and near room temperature) are achieved, with a large EC strength (vertical bar Delta T vertical bar/vertical bar Delta E vertical bar) 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.
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