• Haruta, Yuki

Abstract

<jats:title>Abstract</jats:title><jats:p>X-ray imaging is a valuable technique used for medical imaging and non-destructive inspection of industrial products. However, the radiation may put humans at risk of developing cancer. Consequently, highly sensitive X-ray detectors, which enable X-ray imaging at a low dose rate, are required. Metal halide perovskite materials have demonstrated excellent X-ray detection performance including a high sensitivity owing to their high absorption coefficient, high carrier mobility, and long carrier lifetime. However, perovskite thick films with a large area, which is essential to realize the application of such materials to X-ray imaging devices have not been extensively investigated. To this end, in this study, a polymer is employed as a buffer layer to avoid film exfoliation, which makes it difficult to fabricate perovskite thick films, and a 110-μm-thick CsPbBr<jats:sub>3</jats:sub> film is successfully obtained using a scalable solution method. In addition, an X-ray detector based on the CsPbBr<jats:sub>3</jats:sub> thick film is fabricated, which demonstrates a sensitivity of 11,840 μC Gy<jats:sub>air</jats:sub><jats:sup>–1</jats:sup> cm<jats:sup>–2</jats:sup>. This sensitivity is approximately 600 times higher than that of the existing commercial a-Se X-ray detectors.</jats:p>

Topics

• Deposition
• perovskite
• impedance spectroscopy
• polymer
• mobility