期刊
NANO LETTERS
卷 20, 期 2, 页码 1262-1271出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04727
关键词
Lead-free ferroelectrics; electrocaloric effect; thin film bilayer; first-principles calculations
类别
资金
- Australian Research Council [FT140100135]
- Australian Research Council [FT140100135] Funding Source: Australian Research Council
Conventional refrigeration methods based on compression-expansion cycles of greenhouse gases are environmentally threatening and cannot be miniaturized. Electrocaloric effects driven by electric fields are especially well suited for implementation of built-in cooling in portable electronic devices. However, most known electrocaloric materials present poor cooling performances near room temperature, contain toxic substances, and require high electric fields. Here, we show that lead-free ferroelectric thin-film bilayers composed of (Bi0.5Na0.5)TiO3-BaTiO3 (BNBT) and Ba(Zr0.2Ti0.8)O-3-(Ba0.7Ca0.3)TiO3 (BCZT) display unprecedentedly large electrocaloric effects of , similar to 23 K near room temperature under moderate electric bias. The giant electrocaloric effect observed in BNBT/BCZT bilayers, which largely surpasses the sum of the individual caloric responses measured in BNBT and BCZT, is originated from the presence of compositional bound charges at their interface. Our discovery of interface charge-induced giant electrocaloric effects indicates that multilayered oxide heterostructures hold tremendous promise for developing highly efficient and scalable solid-state cooling applications.
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