Juyoung Ko, Beomjun Park, Jangwon Byun, Sandeep Pandey, Ajin Jo, Joo-Hong Lee, Wonho Lee, Jin-Wook Lee, Nam-Gyu Park, Man-Jong Lee
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This study proposes a facile process for dipping Cs<sub>0.05</sub>FA<sub>0.9</sub>MA<sub>0.05</sub>PbI<sub>3</sub> SCs synthesized by a solution-based inverse temperature crystallization method into a 2-phenylethylammonium iodide (PEAI) solution to reduce the number of defects, inhibit ion migration, and increase x-ray sensitivity. Compared to conventional spin coating, this simple dipping process forms a two-dimensional PEA<sub>2</sub>PbI<sub>4</sub> layer on all SC surfaces without further treatment, effectively passivating all surfaces of the inherently defective SCs and minimizing ion migration. 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引用次数: 0
摘要
卤化物过氧化物单晶体(SC)因其理想的特性,包括低缺陷密度、高迁移率-寿命乘积(μτ)和长载流子扩散长度,在高性能 X 射线探测器中的应用备受关注。然而,抑制过氧化物晶中的固有缺陷并克服主要由这些缺陷引起的离子迁移仍然是一项挑战。本研究提出了一种简便的工艺,将基于溶液逆温结晶法合成的 Cs0.05FA0.9MA0.05PbI3 SCs 浸入 2-苯基乙基碘化铵(PEAI)溶液中,以减少缺陷数量、抑制离子迁移并提高 X 射线灵敏度。与传统的旋涂法相比,这种简单的浸渍工艺无需进一步处理即可在所有 SC 表面形成二维 PEA2PbI4 层,从而有效地钝化了存在固有缺陷的 SC 的所有表面,并最大限度地减少了离子迁移。因此,在 1-5 mGy s-1 的实际临床剂量率(峰值电位为 110 kVp)条件下,经过 PEAI 处理的透视晶 SC 基 X 射线探测器在 30 V 偏置电压下的 X 射线灵敏度达到了创纪录的 1.3 × 105 μC Gyair-1 cm-2,是未经处理的 SC 基探测器的 6 倍,比商用 α-Se 基探测器的灵敏度高出 3 个数量级。此外,经 PEAI 处理的透辉石 SC 型 X 射线探测器的探测极限很低(73 nGy s-1),X 射线响应得到了改善,并能通过扫描方法获得清晰的 X 射线图像,这凸显了 PEAI 浸渍方法在制造下一代 X 射线探测器方面的有效性。
High-performance 110 kVp hard x-ray detector based on all-crystalline-surface passivated perovskite single crystals
Halide perovskite single crystals (SCs) have attracted much attention for their application in high-performance x-ray detectors owing to their desirable properties, including low defect density, high mobility–lifetime product (μτ), and long carrier diffusion length. However, suppressing the inherent defects in perovskites and overcoming the ion migration primarily caused by these defects remains a challenge. This study proposes a facile process for dipping Cs0.05FA0.9MA0.05PbI3 SCs synthesized by a solution-based inverse temperature crystallization method into a 2-phenylethylammonium iodide (PEAI) solution to reduce the number of defects, inhibit ion migration, and increase x-ray sensitivity. Compared to conventional spin coating, this simple dipping process forms a two-dimensional PEA2PbI4 layer on all SC surfaces without further treatment, effectively passivating all surfaces of the inherently defective SCs and minimizing ion migration. As a result, the PEAI-treated perovskite SC-based x-ray detector achieves a record x-ray sensitivity of 1.3 × 105 μC Gyair−1 cm−2 with a bias voltage of 30 V at realistic clinical dose rates of 1–5 mGy s−1 (peak potential of 110 kVp), which is 6 times more sensitive than an untreated SC-based detector and 3 orders of magnitude more sensitive than a commercial α-Se-based detector. Furthermore, the PEAI-treated-perovskite SC-based x-ray detector exhibits a low detection limit (73 nGy s−1), improved x-ray response, and clear x-ray images by a scanning method, highlighting the effectiveness of the PEAI dipping approach for fabricating next-generation x-ray detectors.
期刊介绍:
InfoMat, an interdisciplinary and open-access journal, caters to the growing scientific interest in novel materials with unique electrical, optical, and magnetic properties, focusing on their applications in the rapid advancement of information technology. The journal serves as a high-quality platform for researchers across diverse scientific areas to share their findings, critical opinions, and foster collaboration between the materials science and information technology communities.