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 (|?T|) of 3.3 K and isothermal entropy change (|?S|) of 5.8 J kg-1 K-1 at |?E| = 142.0 kV cm-1 and at 315 K (above and near room temperature) are achieved, with a large EC strength (|?T|/|?E|) 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.
| Original language | English |
|---|---|
| Pages (from-to) | 8760-8765 |
| Number of pages | 6 |
| Journal | ACS Nano |
| Volume | 13 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 27 2019 |
Funding
This material is based upon work partly supported by the Semiconductor Research Corporation (SRC) and DARPA. J.J. and H.W. acknowledge the support from the U.S. Office of Naval Research (N00014-16-1-2465) for the TEM effort. PFM measurements were supported by the Division of Materials Science and Engineering, Basic Energy Sciences, US Department of Energy. BE-PFM experiments were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The authors gratefully acknowledge C. Wall and Montana Instruments for technical support on the temperature-dependent Raman characterization. The authors would also like to thank V. Liubachko and Y. M. Vysochanskii for identifying the heat capacity of CuInP 2 S 6 and valuable discussions. This material is based upon work partly supported by the Semiconductor Research Corporation (SRC) and DARPA. J.J. and H.W. acknowledge the support from the U.S. Office of Naval Research (N00014-16-1-2465) for the TEM effort. PFM measurements were supported by the Division of Materials Science and Engineering, Basic Energy Sciences, US Department of Energy. BE-PFM experiments were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The authors gratefully acknowledge C. Wall and Montana Instruments for technical support on the temperature-dependent Raman characterization. The authors would also like to thank V. Liubachko and Y. M. Vysochanskii for identifying the heat capacity of CuInP2S6 and valuable discussions.
Keywords
- CuInPS
- electrocaloric effect
- ferroelectrics
- room temperature
- two-dimensional