Orthorhombic Non‐Perovskite CsPbI3 Microwires for Stable High‐Resolution X‐Ray Detectors. Issue 13 (1st May 2022) - Kundu, Soumya
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‐CsPbI3 monocrystalline microwires exhibiting one of the highest linear X‐ray absorption coefficients among known semiconductors is reported. In a metal–semiconductor–metal architecture, δ‐CsPbI3 demonstrates one of the lowest detectable X‐ray dose rates at 33.3 nGyair 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 Gyair, which is equivalent to 720 million chest X‐ray scans. The 1D crystalline nature of δ‐CsPbI3 enables a high X‐ray imaging resolution of 12.4 line pairs per millimeter (lp mm −1 ). Abstract : Solution‐grown non‐perovskite δ‐CsPbI3 microwire X‐ray sensors demonstrate the lowest detectable dose rate of 33.3 nGyair s −1 and operational stability to an accumulated dose of 1.44 × 10 6 Gyair, equivalent to 720 million chest X‐ray scans. The 1D crystalline nature of δ‐CsPbI3 leads to a high X‐ray imaging resolution of 12.4 line pairs per millimeter.