Cation-π interactions enabled water-stable perovskite X-ray flat mini-panel imager.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38177148.
- Also identified by DOI 10.1038/s41467-023-44644-7 and PMC identifier 10767000.
- 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
Sensitive and stable perovskite X-ray detectors are attractive in low-dosage medical examinations. The high sensitivity, tunable chemical compositions, electronic dimensions, and low-cost raw materials make perovskites promising next-generation semiconductors. However, their ionic nature brings serious concerns about their chemical and water stability, limiting their applications in well-established technologies like crystal polishing, micro-processing, photolithography, etc. Herein we report a one-dimensional tryptamine lead iodide perovskite, which is stable in water for several months as the strong cation-π interactions between organic cations. The one-dimensional and two-dimensional tryptamine lead iodide perovskite tablets are switchable through thermal-annealing or water-soaking treatments to relax microstrains. The water-stable and microstrain-free one-dimensional perovskite tablets yield a large sensitivity of 2.5 × 10<sup>6</sup> μC Gy<sub>air</sub><sup>-1</sup> cm<sup>-2</sup> with the lowest detectable dose rate of 5 nGy<sub>air</sub> s<sup>-1</sup>. Microelectrode arrays are realized by surface photolithography to construct high-performance X-ray flat mini-panels with good X-ray imaging capability, and a record spatial resolution of 17.2 lp mm<sup>-1</sup> is demonstrated.