Ferroelectric ultraviolet photodetector material with ultrafast response speed.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41469397.
- Also identified by DOI 10.1038/s41467-025-68069-6 and PMC identifier 12868875.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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.e., nearly 10000 times faster than traditional photodetectors). The outstanding properties highlight SATO as an outstanding candidate for next-generation photodetectors.