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

• Published in: Advanced optical materials Vol. 10; no. 13
• Main Authors: Kundu, Soumya, Richtsmeier, Devon, Hart, Alexander, Yeddu, Vishal, Song, Zihao, Niu, Guangda, Thrithamarassery Gangadharan, Deepak, Dennis, Emma, Tang, Jiang, Voznyy, Oleksandr, Bazalova‐Carter, Magdalena, Saidaminov, Makhsud I.
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01-07-2022
• Subjects: Absorptivity; Dark current; Detectors; Dosage; Image resolution; lead halides; low dark current; low detection limit; Materials science; microwires; Optics; Perovskites; radiation detectors; X‐ray detectors
• ISSN: 2195-1071; 2195-1071
• DOI: 10.1002/adom.202200516

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 × 106 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).
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 × 106 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.