| Improvement of energy storage performance by controlling the crystallinity of Aurivillius BaBi4Ti4O15 thin films |
| Yoon Hyung Keum, Hyun Wook Shin, Jong Yeog Son |
| Department of Applied Physics, Institute of Natural Sciences, and Integrated Education Institute for Frontier Science & Technology, Kyung Hee University, Yongin, 17104, Republic of Korea |
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Received: March 5, 2023; Revised: May 23, 2023 Accepted: June 7, 2023. Published online: July 4, 2023. |
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| ABSTRACT |
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We investigated the crystallinity, ferroelectric properties, and energy storage efficiency of Aurivillius BaBi4Ti4O15 (BBTO) thin films epitaxially deposited on single-crystal (001) Rh substrates by pulsed laser deposition method. From X-ray diffraction experiments, it was confirmed that the BBTO thin films had a mixed crystallinity of a-oriented crystallinity and c-oriented crystallinity. The BBTO thin films fabricated by a low substrate temperature and a high deposition rate showed highly a-oriented crystallinity. On the other hand, the BBTO thin films deposited by a high substrate temperature and a low deposition rate showed improved crystallinity with highly c-oriented crystallinity. The BBTO thin film with the highly a-oriented crystallinity showed large remanent polarization, and the BBTO thin film with the highly c-oriented crystallinity showed small remanent polarization but excellent leakage current characteristics. In addition, the BBTO thin film with the highly c-oriented crystallinity exhibited superior energy storage characteristics with a high energy storage density of 32.5 J/cm3 and a high efficiency of 0.8 compared to the BBTO thin film with the highly a-oriented crystallinity. |
| Key words:
BaBi4Ti4O15 thin film · Crystallinity · Ferroelectricity · Energy storage characteristics
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