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<p>Although perovskite crystals exhibit defect tolerance, the presence of crystal defects may still compromise their photodetection performance. In this paper, we study the solution growth of high-quality δ-CsPbI<sub>3</sub> single-crystalline fibers (SCFs), and highlight the impact of crystal quality on the enhancement of the photodetector performances. To achieve high-quality δ-CsPbI<sub>3</sub> SCFs, a seeded growth of δ-CsPbI<sub>3</sub> SCFs is carried out using an optimized HI-DMF growth protocol. In this protocol, fiber seeds picked in HI aqueous solution are seeded to grow in DMF solution. As a result, high-quality flexible δ-CsPbI<sub>3</sub> SCFs with a large length-to-width ratio are obtained. The photodetector fabricated with the high-quality SCF in an Ag/CsPbI<sub>3</sub>/Ag architecture exhibits a low dark current, excellent device stability, a higher signal-to-noise ratio and a ninefold enhancement in photo-responsivity compared with the detector made using defective crystal. These findings establish a critical link between crystal perfection and advanced photodetector functionality, offering new avenues for high-performance X-ray detection technologies.</p> Graphical abstract <p></p> <p>CsPbI<sub>3</sub> single-crystalline fibers prepared by seeded growth exhibit high crystal quality, excellent flexibility and enhanced photodetection performance.</p>

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Seeded growth of high-quality CsPbI3 single-crystalline fibers for photodetection

  • 期刊论文

  • 发表日期：

    2026年1月2日

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  • Mingyue Feng,
  • Chixuan Li,
  • Furu Li,
  • Chengqian Zhang,
  • Yan Ren

摘要

Although perovskite crystals exhibit defect tolerance, the presence of crystal defects may still compromise their photodetection performance. In this paper, we study the solution growth of high-quality δ-CsPbI3 single-crystalline fibers (SCFs), and highlight the impact of crystal quality on the enhancement of the photodetector performances. To achieve high-quality δ-CsPbI3 SCFs, a seeded growth of δ-CsPbI3 SCFs is carried out using an optimized HI-DMF growth protocol. In this protocol, fiber seeds picked in HI aqueous solution are seeded to grow in DMF solution. As a result, high-quality flexible δ-CsPbI3 SCFs with a large length-to-width ratio are obtained. The photodetector fabricated with the high-quality SCF in an Ag/CsPbI3/Ag architecture exhibits a low dark current, excellent device stability, a higher signal-to-noise ratio and a ninefold enhancement in photo-responsivity compared with the detector made using defective crystal. These findings establish a critical link between crystal perfection and advanced photodetector functionality, offering new avenues for high-performance X-ray detection technologies.

Graphical abstract

CsPbI3 single-crystalline fibers prepared by seeded growth exhibit high crystal quality, excellent flexibility and enhanced photodetection performance.