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.
What’s more, as well as dramatically decreasing the level of radiation exposure required for X-ray radiography, the new device is self-powered, the read-outs being entirely powered by the energy generated through X-ray detection.
The paper “Sensitive and robust thin-film x-ray detector using 2D layered perovskite diodes” published in the Science Advances journal describes an X-ray detector that could be produced with low-cost fabrication techniques, unlike silicon-based technology, to 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.
The researchers anticipate that large scale thin-layer detectors could be printed using ink-jet printers, replacing the extremely expensive silicon detector arrays used today.
Los Alamos National Laboratory – www.lanl.gov