Stable and Ultrasensitive X-Ray Detectors Based on Oriented Single-Crystal Perovskite Rods.
basic_science · Level V
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- Record sourced from PubMed, PMID 40269573.
- Also identified by DOI 10.1002/adma.202500101.
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Abstract
Metal-halide perovskite single crystals (SCs) are promising candidates for next-generation X-ray detectors. X-ray detectors fabricated using perovskite FAPbI<sub>3</sub> SCs exhibit high detection sensitivity. However, two pressing issues still need to be addressed for practical applications: the orientation-controlled growth and environmentally friendly acquisition of high-quality FAPbI<sub>3</sub> SCs. In this study, large high-quality perovskite FAPbI<sub>3</sub> SC rods (SCRs) with unique orientation are grown using a biomass-derived green solvent. Owing to the high carrier mobility and large bulk resistivity of the oriented FAPbI<sub>3</sub> SCRs, the SC detectors realize a record high X-ray detection sensitivity (2.16 × 10<sup>5</sup> µC Gy<sup>-1</sup> cm<sup>-2</sup>) and high sensitivity to dark current density ratio (1.93 × 10<sup>9</sup> Gy<sup>-1</sup> s). Furthermore, the detectors exhibit both ultralow dark and X-ray current drifts, as well as a detection limit of 2 nGy s<sup>-1</sup>. These characteristics enable the detectors to achieve high-resolution X-ray imaging, even at dose rates as low as 12 nGy s<sup>-1</sup>. This study not only contributes a new technical solution for low-dose X-ray detection, but also establishes a new approach for the low-cost and environmentally friendly production of core materials for X-ray detectors.