The emerging 2D layered perovskites have promising optoelectronic properties, good intrinsic stability and reduced ion migration, making them effective for detecting X‐ray radiation. However, their application is constrained by poor out‐of‐plane carrier transport. In this study, inch‐sized high‐quality CsPb2Br5 layered single crystals (SCs) are developed using an organic ligand‐assisted solution process. By modifying the surface energy, the anisotropy of crystal growth is conquered, resulting in CsPb2Br5 SCs with sufficient thickness for X‐ray detection. Importantly, this modification significantly enhanced the crystal quality as the grown CsPb2Br5 SCs exhibited longer photoluminescence lifetime and smaller trap density. Notably, the CsPb2Br5 SCs demonstrate unprecedented out‐of‐plane carrier transport, achieving a high carrier mobility‐lifetime product of 2.53 × 10−2 cm2V−1. This can be attributed to the small interlayer distance and the strong interlayer force of Cs─Br bonding. Furthermore, CsPb2Br5 SCs possess other intriguing attributes for X‐ray detection, including high bulk resistivity and outstanding thermal stability. These advantageous properties enable high‐performance vertical‐structure X‐ray detection with a superior sensitivity of up to 8865.6 µC Gyair−1cm−2 and a low detectable dose rate of 12.7 nGyairs−1. Additionally, CsPb2Br5 SCs exhibit high spatial resolution in X‐ray imaging and exceptional thermal stability, making them promising candidates for nondestructive determination.

中文翻译：

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用于高灵敏度 X 射线探测器的 2D 钙钛矿单晶的配体辅助生长

新兴的二维层状钙钛矿具有良好的光电特性、良好的内在稳定性和减少的离子迁移，使其能够有效地检测X射线辐射。然而，它们的应用受到较差的平面外载体传输的限制。在本研究中，英寸尺寸的高质量 CsPb2溴5层状单晶（SC）是使用有机配体辅助溶液工艺开发的。通过改变表面能，克服晶体生长的各向异性，得到CsPb2溴5SC 具有足够的厚度用于 X 射线检测。重要的是，这种修改显着提高了晶体质量，因为生长的 CsPb2溴5SCs表现出更长的光致发光寿命和更小的陷阱密度。值得注意的是，CsPb2溴5SC 展示了前所未有的面外载流子传输，实现了 2.53 × 10 的高载流子迁移率寿命乘积−2厘米2V−1。这可归因于Cs─Br键合的层间距离小和层间力强。此外，CsPb2溴5SC 还具有 X 射线检测的其他有趣属性，包括高体电阻率和出色的热稳定性。这些有利的特性可实现高性能垂直结构 X 射线检测，灵敏度高达 8865.6 µC Gy空气−1厘米−2可检测剂量率低至 12.7 nGy空气s−1。此外，CsPb2溴5SC 在 X 射线成像中表现出高空间分辨率和出色的热稳定性，使其成为无损测定的有希望的候选者。