Oriented Alignment of CsPbBr<sub>3</sub> Single-Crystal Arrays for Flexible X-ray Imaging.
basic_science · Level V
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- Record sourced from PubMed, PMID 39225661.
- Also identified by DOI 10.1021/acs.nanolett.4c03651.
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Abstract
The utilization of perovskite materials in flexible optoelectronics is experiencing distinct diversification including X-ray detection applications. Here, we report the oriented alignment of cesium lead bromide (CsPbBr<sub>3</sub>) single-crystal arrays on flexible polydimethylsiloxane (PDMS) substrates. By precisely confining the crystallization process within spatially delimited precursor droplets, we achieve a well-oriented crystal alignment through the spontaneous rotation of the CsPbBr<sub>3</sub> microcuboids. This approach allows for precise control over the microcuboid morphologies by varying the growth temperature. We design flexible X-ray detector arrays by seamlessly integrating CsPbBr<sub>3</sub> microcuboids with electrode arrays. The flexible X-ray detector can output a high sensitivity of 1.97 × 10<sup>5</sup> μC·Gy<sub>air</sub><sup>-1</sup>·cm<sup>-2</sup> and a low detection limit of 89 nGy<sub>air</sub>·s<sup>-1</sup> after the surface passivation process. The excellent mechanical properties, outstanding X-ray detection capabilities, and high pixel uniformity are also demonstrated in conformal X-ray imaging of curved surfaces.