Enhanced Pyroelectric Response in Quenched BNT‐Based Lead‐Free Ferroelectrics for Uncooled Infrared Detection

Enhanced Pyroelectric Response in Quenched BNT‐Based Lead‐Free Ferroelectrics for Uncooled Infrared Detection

Advanced Functional Materials

10.1002/adfm.202423055

https://doi.org/10.1002/adfm.202423055

Meng Shen, Xian Zhang, Fangjie Cen, Qingfeng Zhang, Haibo Zhang, Guangzu Zhang, Shenglin Jiang, Yong Chen, Yongming Hu, Kui Yao

Oxygen vacancies engineering, pyroelectric infrared detector, BNT-based, quenched

03 April 2025

Shen, M., Zhang, X., Cen, F., Zhang, Q., Zhang, H., Zhang, G., Jiang, S., Chen, Y., Hu, Y., & Yao, K. (2025). Enhanced Pyroelectric Response in Quenched BNT‐Based Lead‐Free Ferroelectrics for Uncooled Infrared Detection. Advanced Functional Materials, 35(36). Portico. https://doi.org/10.1002/adfm.202423055

Excellent pyroelectric performance in environmentally friendly lead-free ferroelectrics is highly demanded for uncooled infrared detector. However, the trade-off between room Advanced Functional Materials, DOI: 10.1002/adfm.202423055, online on 03 April 2025, 2423055, Vol. 35, No. 36, Sep. 2025 2 temperature pyroelectric coefficient (proom) and depolarization temperature (Td) remains a major challenge of lead-free ferroelectrics for their device applications. Herein, a superior proom of 13.8×10-4 C m-2 K-1 with high Td of 155 oC is achieved in quenched BNT-Fe/Mn-NBT sample. Oxygen vacancy engineering is proposed to solve the constraint between proom and Td in BNT-based ceramics. The local A/B site displacement and oxygen vacancies are constructed in the BNT-Fe/Mn-NBT perovskite structure by quenching treatment, resulting in larger lattice distortion and superior proom. Meanwhile, defect-induced inhomogeneous random field compensates the ferroelectric depolarization field and down-shifts the free energy well, maintaining high Td. The resulting pyroelectric infrared detector made from the high-performance quenched BNT-Fe/Mn-NBT generates the voltage responsivity of 5906 V W-1 and specific detection rate of 1.8×108 cm Hz1/2 W-1, which is comparable to the commercial RD-624 type PZT-based pyroelectric infrared detector

Publisher Copyright

This research / project is supported by the A*STAR - Advanced Manufacturing and Engineering (AME) Programmatic Fund
Grant Reference no. : A20G9b0135

This is the peer reviewed version of the following article: Shen, M., Zhang, X., Cen, F., Zhang, Q., Zhang, H., Zhang, G., Jiang, S., Chen, Y., Hu, Y., & Yao, K. (2025). Enhanced Pyroelectric Response in Quenched BNT‐Based Lead‐Free Ferroelectrics for Uncooled Infrared Detection. Advanced Functional Materials, 35(36). Portico. https://doi.org/10.1002/adfm.202423055 , which has been published in final form at https://doi.org/10.1002/adfm.202423055. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

https://oar.a-star.edu.sg/communities-collections/articles/22791

1616-301X
1616-3028

Institute of Materials Research and Engineering