Organic-inorganic perovskite single crystals (SCs) are considered promising semiconductors for high-sensitivity X-ray detectors because of their strong X-ray interaction, low-temperature processability, and excellent properties such as long diffusion length, low defect density, and long carrier lifetime. However, the specific pulse response of MAPbBr SC-based X-ray detectors frequently exhibits a tail and over/undershoots at several conditions, which degrades the X-ray image quality; however, no detailed analysis of these characteristics has been reported thus far. For high-resolution X-ray imaging, it is necessary to obtain an ideal pulse response that is free of tails and over/undershoots. In this study, we investigated the specific X-ray responses of solution-grown MAPbBr SC-based X-ray detectors under various externally applied voltages. Based on the study on charge carrier dynamics, we analyzed the origin of the tail and over/undershoots in X-ray pulse response shapes. We theoretically verified that the unideal pulse response in perovskite SC-based X-ray detectors is attributed to the defect states inherent in perovskite SCs.

中文翻译：

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MAPbBr3 单晶探测器中的异常 X 射线脉冲响应

有机-无机钙钛矿单晶（SC）因其强X射线相互作用、低温加工性以及长扩散长度、低缺陷密度和长寿命等优异性能而被认为是高灵敏度X射线探测器的有前途的半导体。载流子寿命。然而，基于 MAPbBr SC 的 X 射线探测器的特定脉冲响应在多种条件下经常出现拖尾和过冲/下冲，从而降低了 X 射线图像质量；然而，迄今为止尚未报道对这些特征的详细分析。对于高分辨率 X 射线成像，必须获得没有拖尾和过冲/下冲的理想脉冲响应。在这项研究中，我们研究了溶液生长的基于 MAPbBr SC 的 X 射线探测器在各种外部施加电压下的特定 X 射线响应。基于载流子动力学研究，我们分析了X射线脉冲响应形状的尾部和过冲/下冲的起源。我们从理论上验证了基于钙钛矿 SC 的 X 射线探测器中不理想的脉冲响应归因于钙钛矿 SC 固有的缺陷态。