Sensitive and Stable Ruddlesden–Popper Perovskite X-ray Detectors via Defect Passivation
Sensitive and Stable Ruddlesden–Popper Perovskite X-ray Detectors via Defect Passivation
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DOI：
10.1021/acs.jpcc.3c04284
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发表时间：
2023-08
期刊：
影响因子：
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通讯作者：
M. Zhang;Lin Lei;Wei Zhao;Dingyu Yang;Xiaojia Zheng;Wen-Hua Zhang
中科院分区：
文献类型：
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作者：
M. Zhang;Lin Lei;Wei Zhao;Dingyu Yang;Xiaojia Zheng;Wen-Hua Zhang
低维卤化物钙钛矿X射线探测器是有利的，因为它们的高离子活化能和在外部刺激（例如热和潮湿空气）下的良好固有稳定性。在此，通过引入4-氨基苯甲腈（ABN）分子对BA 2 MA 9 Pb 10 I31准二维钙钛矿进行改性，并评估其在X射线探测器中的性能。结果表明，ABN的加入有效地提高了钙钛矿中的电荷传输性能，降低了电荷复合速率，抑制了离子迁移。ABN添加剂提高了X射线探测器在低X射线剂量率下的探测能力，表现出更高的灵敏度和更低的探测极限。最后，获得了灵敏度为8000 μC Gyair-1cm-2、检出限（LoD）为6.8 nGyair-1、检测效率为115%的BA 2 MA 9 Pb 10 I31 X射线探测器，优于灵敏度为20 μC Gyair-1cm-2、LoD为5500 nGyair-1的商品化非晶硒探测器。研究结果表明，钝化钙钛矿型X射线探测器中的带电缺陷对于提高其X射线探测性能至关重要。
Low-dimensional halide perovskite X-ray detectors are advantageous because of their high ionic activation energy and good intrinsic stability under external stimulation, such as heat and humid air. Here, the BA2MA9Pb10I31quasi-2D perovskite was modified by incorporating 4-aminobenzonitrile (ABN) molecules, and its performance in X-ray detectors was evaluated. The results demonstrate that the addition of ABN effectively enhances the charge transport properties, reduces the charge recombination rate, and suppresses ion migration in the perovskite. The ABN additive improves the X-ray detector’s detection capability at low X-ray dose rates, exhibiting higher sensitivity and lower detection limits. Finally, a BA2MA9Pb10I31X-ray detector exhibiting a sensitivity of ∼8000 μC Gyair–1cm–2, a limit of detection (LoD) of 6.8 nGyairs–1, and a detection efficiency of 115% was obtained, which is outperforming than that of a commercialized amorphous selenium detector with a sensitivity of 20 μC Gyair–1cm–2and a LoD of 5500 nGyairs–1. Results presented here indicate that passivating the charged defects in perovskite X-ray detectors is crucial for improving their X-ray detection performance.