Journal Article

Anti-perovskites with long carrier lifetime for ultralow dose and stable X-ray detection

Feng, Yan, Wang, Ze-Jie, Niu, Guangda, Chen, Ming-Xing, Liu, Yan, Shen, Huai-Yi, Tang, Jiang, Ye, Heng-Yun, Liu, Shi-Yu, Shi, Yuanpeng, Zhao, Shan, Fang, Cui-Ling, Liu, Lang, Ma, Yan

2024

Overview

Halide perovskites have shown promising potential for direct X-ray detection due to their high X-ray absorption coefficient, low trap states and convenient fabrication process. However, it is still a challenge to achieve high sensitivity, low dark current and low detection limit in a single material. The deep reason for this is the trade-off between the material’s μτ product and resistivity. Here we report the construction of an organic–inorganic hybrid anti-perovskite ((2-Habch) 3 Cl(PtI 6 )) with indirect transition and low orbital symmetry at the band edge to achieve an ultralong intrinsic lifetime and thus break the trade-off. (2-Habch) 3 Cl(PtI 6 ) achieves an unprecedented long carrier lifetime of >3 ms, leading to a large μτ product of 6.25 × 10 −3  cm 2  V −1 and high resistivity of 10 12  Ω cm, outperforming most X-ray detection materials. These properties enabled the development of X-ray detectors that simultaneously achieve an ultralow dark current of 0.21 nA cm −2 , high sensitivity of 1.0 × 10 4  µC Gy air −1  cm −2 , ultralow detection limit of 2.4 nGy air  s −1 and excellent operational stability with no observable baseline drift, outperforming state-of-the-art perovskite single-crystal detectors. The rare combination of high performance in almost every figure of merit in the anti-perovskite-based X-ray detector could enable new-generation X-ray detection systems. The researchers synthesize organic–inorganic hybrid inverse perovskites that exhibit excellent carrier lifetime and mobility–lifetime product and high resistivity, enabling stable X-ray detectors with performance arguably outperforming state-of-the-art perovskite single-crystal detectors.

• Publisher: Nature Publishing Group UK,Nature Publishing Group
• Subject: 639/301/1019 / 639/624 / Absorptivity / Applied and Technical Physics / Carrier lifetime / Dark current / Electrical resistivity / Fabrication / Figure of merit / Perovskites / Physics / Physics and Astronomy / Quantum Physics / Sensitivity / Sensors / Single crystals / Tradeoffs / X ray absorption / X ray detectors / X-rays