A bulk Schottky junction for high-sensitivity portable radiation detectors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39604377.
- Also identified by DOI 10.1038/s41467-024-54594-3 and PMC identifier 11603327.
- Licence recorded as CC BY-NC-ND.
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Abstract
The thickness of X-ray detectors needs to reach hundreds of micrometers to absorb X-ray, and therefore, high voltages over tens or hundreds of volts should be applied to extract X-ray-generated carriers. Here, we propose a bulk Schottky junction for X-ray detection using interpenetrated macroporous-carbon electrodes and metal-halide perovskite networks. The X-ray-generated holes are extracted by the macroporous-carbon electrodes under the built-in electric field, while the electrons in the perovskite phase result in a high gain effect. A high sensitivity of 1.42×10<sup>5</sup> μC Gy<sub>air</sub><sup>-1</sup> cm<sup>-2</sup> and a low detection limit of 48 nGy<sub>air</sub> s<sup>-1</sup> at a low voltage of -1 V are achieved. We fabricated a dry battery-powered portable X-ray alarm prototype. The pixel detector shows a decent stability under X-ray exposure, and a spatial resolution of up to 5.0 lp mm<sup>-1</sup>, and the detector arrays also exhibit remarkable uniformity, demonstrating its potential application in X-ray imaging.