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 Gy_air⁻¹ cm⁻² under a bias voltage of 30 V. Furthermore, the detector shows a sensitivity of 293 µC Gy_air⁻¹ cm⁻² and detection limit of 51.38 nGy_air 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 HAPbI ₄ （HPI、HA = 组胺）演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，制造的探测器显示出 7737 μC Gy _air ⁻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 Gy _air ⁻¹ cm ⁻² 的灵敏度和 51.38 nGy _air s 的 ⁻¹ 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。