Eradicating impurities in zero-dimensional metal lead halide perovskite films for stable, low dark current X-ray detectors

Jin，Handong1,2; Wang，Jian2; Li，Yu1,2; Yu，Shanshan2; Chen，Xin3; Liu，Qi2; Yang，Shihe1,2

2023-12-20

10.1016/j.xcrp.2023.101727

Cell Reports Physical Science   影响因子和分区

2666-3864

Zero-dimensional cesium lead halide (CsPbI) perovskite shows great potential in direct X-ray detection with a low dark current and high stability, but impurity phases including cesium iodide (CsI) and CsPbI can easily form in polycrystalline CsPbI films. Herein, we explore the growth kinetics of CsPbI polycrystal thick films via spray-coating method by optimizing their structure, composition, and optical properties. Combined experimental and computational studies disclose that under high-temperature annealing, CsPbI crystals decompose and form impurities, which could be eliminated by controlling the annealing temperature. The optimized thick film enables a high on/off ratio and a super-low dark current (3 nA cm) X-ray detector device of an FTO/CsPbI/carbon sandwich with a decent sensitivity of 245 μCGycm under 30 keV X-ray irradiation at an applied electric field of 55 V mm. The device remains stable after continuous operation for a total accumulated dose of 8.17 × 10 mGy, equivalent to 4 million chest X-ray scans.

impurity phase perovskite micro-crystal spray coating X-ray detection X-ray imaging

SCI

英语

其他

2-s2.0-85180608697

Scopus

1.Guangdong Key Lab of Nano-Micro Material Research,School of Chemical Biology and Biotechnology,Shenzhen Graduate School,Peking University,Shenzhen,518055,China
2.Institute of Biomedical Engineering,Shenzhen Bay Laboratory,Shenzhen,518132,China
3.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Jin，Handong,Wang，Jian,Li，Yu,et al. Eradicating impurities in zero-dimensional metal lead halide perovskite films for stable, low dark current X-ray detectors[J]. Cell Reports Physical Science,2023,4(12).

Jin，Handong.,Wang，Jian.,Li，Yu.,Yu，Shanshan.,Chen，Xin.,...&Yang，Shihe.(2023).Eradicating impurities in zero-dimensional metal lead halide perovskite films for stable, low dark current X-ray detectors.Cell Reports Physical Science,4(12).

Jin，Handong,et al."Eradicating impurities in zero-dimensional metal lead halide perovskite films for stable, low dark current X-ray detectors".Cell Reports Physical Science 4.12(2023).