Orthorhombic Non‐Perovskite CsPbI 3 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: 01-07-2022
• 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‐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
).