2026-10-12 中国科学院（CAS）
Full-wavelength switchable photoexcited pyroelectricity in a perovskite ferroelectric (Image by Prof. SUN Zhihua’s group)
＜関連情報＞
- https://english.cas.cn/newsroom/research-news/202610/t20261012_1202298.shtml
- https://onlinelibrary.wiley.com/doi/10.1002/anie.1197888
ペロブスカイト強誘電体における全波長光励起焦電効果の実現による長波長赤外線検出 Achieve the Full-Wavelength Photoexcited Pyroelectricity in Perovskite Ferroelectric for Long-Wave Infrared Detection
Liwei Tang, Yujie Zhong, Jialu Chen, Ji Qi, Yi Liu, Yu Ma, Chen Gong, Shuncong Zhong, Junhua Luo, Zhihua Sun
Angewandte Chemie International Edition Published: 03 September 2026
DOI:https://doi.org/10.1002/anie.1197888
ABSTRACT
Ferroelectric materials have emerged as a promising class of optoelectronic candidates, due to their strong light-polarization couplings that lead to fascinating physical attributes. Especially, photoexcited pyroelectricity originating from light-induced variation of spontaneous polarization (Ps) holds potentials for ultra-broadband photodetection even up to long-wave infrared optical region. For the first time, we present the full-wavelength switchable photoexcited pyroelectric effects in a two-dimensional perovskite ferroelectric, (4-ethylanilinium)2(ethylammonium)2Pb3Br10 (1), covering ultraviolet to long-wave infrared spectral range. It is a high-temperature ferroelectric (Tc = 390 K) with superior pyroelectricity, including large pyroelectric coefficients and figure-of-merits. Strikingly, robust full-wavelength photoexcited pyroelectric responses are obtained in 1 under irradiation from ultraviolet (266 nm) to long-wave infrared (12.5 µm) region, far beyond its intrinsic optical bandgap. These Ps-dependent photoactivities can be electrically switched and controlled by electric poling. Thus, crystal-based device of 1 allows ultrabroadband photodetection, as verified by highly-sensitive response to human radiation. As the first report on full-wavelength photoexcited pyroelectricity in perovskite ferroelectrics, our study highlights a promising strategy for new-generation broadband optoelectronic devices.
