Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 42, Pages 29033-29040Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp05462e
Keywords
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Funding
- Ministry of Science and Technology of China through a 973-Project [2012CB619401]
- Natural Science Foundation of China [51431007, 51321003]
- fundamental research funds for the central universities from Ministry of Education
- MOE innovation team from Ministry of Education [IRT13034]
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A giant electrocaloric effect (ECE) can be achieved in ferroelectric thin films, which demonstrates the applications of thin films in alternative cooling. However, electrocaloric thin films fabricated by conventional techniques, such as the pulsed laser deposition or sol-gel methods, may be limited by high costs, low yield and their dependence on substrates. In this study, we present a new bottom-up strategy to construct electrocaloric Ba0.8Sr0.2TiO3 thin films by assembling precisely designed building blocks of ferroelectric nano-cubes, which is supported by detailed structural characterization. Moreover, it is found that our assembled Ba0.8Sr0.2TiO3 films differ remarkably from both individual Ba0.8Sr0.2TiO3 NPs and bulk Ba0.8Sr0.2TiO3 ceramics in terms of new collective ferroelectric properties, including superior and diffused permittivity constants and polarization-electric field loops. Benefiting from these unique ferroelectric properties, a giant ECE (9.1 K) over a broad temperature range (20 degrees C to 60 degrees C) is achieved, which is very large in the lead-free oxide film. Clearly, this bottom-up strategy provides a promising pathway for developing high electrocaloric effect devices.
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