Orthorhombic Non‐Perovskite CsPbI<sub>3</sub> Microwires for Stable High‐Resolution X‐Ray Detectors
Soumya Kundu, Devon Richtsmeier, Alexander Hart, Vishal Yeddu, Zihao Song, Guangda Niu, Deepak Thrithamarassery Gangadharan, Emma Dennis, Jiang Tang, Oleksandr Voznyy, Magdalena Bazalova‐Carter, Makhsud I. Saidaminov
Abstract
Abstract 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 3 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 3 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 × 10 6 Gy air , which is equivalent to 720 million chest X‐ray scans. The 1D crystalline nature of δ‐CsPbI 3 enables a high X‐ray imaging resolution of 12.4 line pairs per millimeter (lp mm −1 ).