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<p>Ferroelectric films are promising to be used for high-performance photodetectors due to their intrinsic electric fields and high dielectric constants. However, the presence of high-density domains with varying polarization directions can severely degrade comprehensive performance. Here, we fabricate high-quality SrAl<sub>11-δ</sub>TiO<sub>19</sub> (SATO) ferroelectric films through a solid-state reaction. The SATO film possesses a magnetoplumbite-type structure with polarization along the c-axis and exhibits the possibility of single-domain ferroelectrics. Ferroelectric performance tests show that the remnant polarization of SATO film reaches 7.8 μC/cm<sup>2</sup> and the polarization retention exceeds 500 hours. Optoelectronic performance measurements reveal that the SATO photodetector exhibits excellent performance with response wavelength of 330 nm, responsivity of 860 mA/W, detectivity of 1.63 × 10<sup>13</sup> Jones, switching ratio of 1.9 × 10<sup>4</sup>, and ultrafast rise/fall response speed of 6.8 ns/17.7 ns (<i>i.e</i>., nearly 10000 times faster than traditional photodetectors). The outstanding properties highlight SATO as an outstanding candidate for next-generation photodetectors.</p>

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Ferroelectric ultraviolet photodetector material with ultrafast response speed

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月30日

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  • Xuexi Yan,
  • Tingting Yan,
  • Lingli Li,
  • Yi Cao,
  • Xinwei Wang,
  • Jinghui Wang,
  • Ang Tao,
  • Tingting Yao,
  • Yixiao Jiang,
  • Weijin Hu,
  • Xiaosheng Fang,
  • Hengqiang Ye,
  • Xiu-Liang Ma,
  • Chunlin Chen

摘要

Ferroelectric films are promising to be used for high-performance photodetectors due to their intrinsic electric fields and high dielectric constants. However, the presence of high-density domains with varying polarization directions can severely degrade comprehensive performance. Here, we fabricate high-quality SrAl11-δTiO19 (SATO) ferroelectric films through a solid-state reaction. The SATO film possesses a magnetoplumbite-type structure with polarization along the c-axis and exhibits the possibility of single-domain ferroelectrics. Ferroelectric performance tests show that the remnant polarization of SATO film reaches 7.8 μC/cm2 and the polarization retention exceeds 500 hours. Optoelectronic performance measurements reveal that the SATO photodetector exhibits excellent performance with response wavelength of 330 nm, responsivity of 860 mA/W, detectivity of 1.63 × 1013 Jones, switching ratio of 1.9 × 104, and ultrafast rise/fall response speed of 6.8 ns/17.7 ns (i.e., nearly 10000 times faster than traditional photodetectors). The outstanding properties highlight SATO as an outstanding candidate for next-generation photodetectors.