Orthorhombic Non-Perovskite CsPbI3 Microwires for Stable High-Resolution X-Ray Detectors

X-ray detectors are used widely, but they suffer from short operational stability and insufficient absorptivity of X-ray photons. Here, a strategy for room-temperature, solution-grown delta-CsPbI3 monocrystalline microwires exhibiting one of the highest linear X-ray absorption coefficients among known semiconductors is reported. In a metal-semiconductor-metal architecture, delta-CsPbI3 demonstrates one of the lowest detectable X-ray dose rates at 33.3 nGy(air) s(-1), enabled by its exceptionally low dark current density of 12 pA mm(-2). The detector remains stable following a continuous operation for a total accumulated dose of 1.44 x 10(6) Gy(air), which is equivalent to 720 million chest X-ray scans. The 1D crystalline nature of delta-CsPbI3 enables a high X-ray imaging resolution of 12.4 line pairs per millimeter (lp mm(-1)).