A new X-ray detector prototype is on the brink of revolutionizing medical imaging, with dramatic reduction in radiation exposure and the associated health risks, while also boosting resolution in security scanners and research applications.
The perovskite material at the heart of this detector prototype can be produced with low-cost fabrication techniques.
The result is a cost-effective, highly sensitive, and self-powered detector that could radically improve existing X-ray detectors, and potentially lead to a host of unforeseen applications
The detector replaces silicon-based technology with a structure built around a thin film of the mineral perovskite, resulting in a hundred times more sensitivity than conventional silicon-based detectors. In addition, the new perovskite detector does not require an outside power source to produce electrical signals in response to X-rays.
High sensitivity perovskite detectors could enable dental and medical images that require a tiny fraction of the exposure that accompanies conventional X-ray imaging. Reduced exposure decreases risks for patients and medical staff alike. The fact that perovskite detectors can be made very thin allows them to offer increased resolution for highly detailed images, which will lead to improved medical evaluations and diagnoses. Lower-energy and increased-resolution detectors could also revolutionize security scanners and imaging in X-ray research applications.
Because perovskite is rich in heavy elements, such as lead and iodine, X-rays that easily pass through silicon undetected are more readily absorbed, and detected, in perovskite. As a result, perovskite significantly outperforms silicon, particularly at detecting high-energy X-rays. This is a crucial advantage when it comes to monitoring X-rays at high-energy research facilities, such as synchrotron light sources.
Perovskite films can be deposited on surfaces by spraying solutions that cure and leave thin layers of the material behind. As a result, the thin-layer detectors will be much easier and cheaper to produce than silicon-based detectors, which require high-temperature metal deposition under vacuum conditions.
News Source: Eurekalert
