Origami-inspired perovskite X-ray detector by printing and folding

Abstract

X-ray detectors are of pivotal importance for the scientific and technological progress in a wide range of medical, industrial, and scientific applications. Here, we take advantage of the printability of perovskite-based semiconductors and achieve a high X-ray sensitivity combined with the potential of an exceptional high spatial resolution by our origami-inspired folded perovskite X-ray detector. The high performance of our device is reached solely by the folded detector architecture and does not require any photolithography. The design and fabrication of a foldable perovskite sensor array is presented and the detector is characterized as a planar and as a folded device. Exposed to 50 kVp−150 kVp X-ray radiation, the planar detector reaches X-ray sensitivities of 25−35 μC/(Gyaircm2), whereas the folded detector achieves remarkably increased X-ray sensitivities of several hundred μC/(Gyaircm2) and a record value of 1409 μC/(Gyaircm2) at 150 kVp without photoconductive gain. Finally, the potential of an exceptional high spatial resolution of the folded detector of more than 20 lp/mm under 150 kVp X-ray radiation is demonstrated.

Fast fabrication of μm-thick perovskite films by using a one-step doctor-blade coating method for direct X-ray detectors

“…The X-ray detector prepared by printing processes requires multiple folding of flexible X-ray detectors to achieve a comparable sensitivity of 25-35 mC Gy air À1 cm À2 . 69 Our study demonstrates a facile fabrication process for X-ray photodetector fabrication with a fast fabrication period. On the other hand, for the X-ray photodetector without adding 18C6 (the thickness of perovskite photoactive film is B2.5 mm), the maximum sensitivity of 4.33 mC Gy air À1 cm À2 is achieved under an electric field of À0.4 V mm À1 .…”