Printable Perovskite Diodes for Broad‐Spectrum Multienergy X‐Ray Detection

Abstract Multienergy X‐ray detection is critical to effectively differentiate materials in a variety of diagnostic radiology and nondestructive testing applications. Silicon and selenium X‐ray detectors are the most common for multienergy detection; however, these present poor energy discrimination across the broad X‐ray spectrum and exhibit limited spatial resolution due to the high thicknesses required for radiation attenuation. Here, an X‐ray detector based on solution‐processed thin‐film metal halide perovskite that overcomes these challenges is introduced. By harnessing an optimized n‐i‐p diode configuration, operation is achieved across a broad range of soft and hard X‐ray energies stemming from 0.1 to 10's of keV. Through detailed experimental and simulation work, it is shown that optimized Cs_0.1FA_0.9PbI₃ perovskites effectively attenuate soft and hard X‐rays, while also possessing excellent electrical properties to result in X‐ray detectors with high sensitivity factors that exceed 5 × 10³ and 6 × 10⁴ µC Gy⁻¹ cm⁻² within soft and hard X‐ray regimes, respectively. Harnessing the solution‐processable nature of the perovskites, roll‐to‐roll printable X‐ray detectors on flexible substrates are also demonstrated.