Lead halide perovskites have emerged as attractive X‐ray detector materials, owing to properties such as strong X‐ray stopping power, excellent carrier transport, and high sensitivity. Additionally, they can be easily prepared by using solution‐based synthesis approaches. However, traditional 3D (three‐dimensional) perovskites X‐ray detectors have shown limited application due to high dark currents generated under bias voltage as a result of strong ion migration. In this work, an X‐ray detector with a vertical structure device is demonstrated using 2D (two‐dimensional) histamine lead halide perovskite single crystal HAPbI4 (HPI, HA = histamine). Due to the dielectric screening effect of diamine and the vertical structure of the HPI device, the fabricated detector shows a sensitivity of 7737 µC Gyair−1 cm−2 under a bias voltage of 30 V. Furthermore, the detector shows a sensitivity of 293 µC Gyair−1 cm−2 and detection limit of 51.38 nGyair s−1 without bias voltage, wherein the dark current is almost completely suppressed. All of these properties indicate the X‐ray detection device is a promising candidate for next‐generation optoelectronic applications.

中文翻译：

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二维组胺铅碘钙钛矿单晶中的暗电流抑制，用于 X 射线检测和成像


卤化铅钙钛矿因其强大的 X 射线阻止能力、出色的载流子传输和高灵敏度等特性而成为有吸引力的 X 射线探测器材料。此外，它们可以通过使用基于溶液的合成方法轻松制备。然而，传统的 3D（三维）钙钛矿 X 射线探测器由于强离子迁移在偏置电压下产生高暗电流，因此应用受到限制。在这项工作中，使用 2D（二维）组胺卤化铅钙钛矿单晶 HAPbI4 （HPI， HA = 组胺） 展示了具有垂直结构装置的 X 射线探测器。由于二胺的介电屏蔽效应和 HPI 器件的垂直结构，在 30 V 的偏置电压下，制造的检测器显示出 7737 μC Gyair−1 cm−2 的灵敏度。此外，该检测器在没有偏置电压的情况下显示出 293 μC Gyair-1 cm-2 的灵敏度和 51.38 nGyair s-1 的检测限，其中暗电流几乎被完全抑制。所有这些特性都表明 X 射线检测设备是下一代光电应用的有前途的候选者。