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Richtsmeier, Devon
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article
Orthorhombic Non‐Perovskite CsPbI<sub>3</sub> Microwires for Stable High‐Resolution X‐Ray Detectors
Abstract
<jats:title>Abstract</jats:title><jats:p>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 δ‐CsPbI<jats:sub>3</jats:sub> monocrystalline microwires exhibiting one of the highest linear X‐ray absorption coefficients among known semiconductors is reported. In a metal–semiconductor–metal architecture, δ‐CsPbI<jats:sub>3</jats:sub> demonstrates one of the lowest detectable X‐ray dose rates at 33.3 nGy<jats:sub>air</jats:sub> s<jats:sup>−1</jats:sup>, enabled by its exceptionally low dark current density of 12 pA mm<jats:sup>−2</jats:sup>. The detector remains stable following a continuous operation for a total accumulated dose of 1.44 × 10<jats:sup>6</jats:sup> Gy<jats:sub>air</jats:sub>, which is equivalent to 720 million chest X‐ray scans. The 1D crystalline nature of δ‐CsPbI<jats:sub>3</jats:sub> enables a high X‐ray imaging resolution of 12.4 line pairs per millimeter (lp mm<jats:sup>−1</jats:sup>).</jats:p>