Two-dimensional (2D) perovskites have better long-term stability, better ion migration inhibition ability, and lower dark current in X-ray detection due to the hindrance effect of organic cations. However, this also limits the charge carrier transport and lowers the device sensitivity. Here, we report a new trans-copper glycinate lead bromide (Cu(Gly)₂Pb₂Br₄) perovskite-like single crystal. Through the cross-linking strategy of metal ions, the charge carrier transport ability of Cu(Gly)₂Pb₂Br₄ along the out-of-plane direction was greatly improved. The record high hole mobility of 54.1 cm² V^–1 s^–1 enables a high sensitivity of 26 589 μC Gy_air^–1 cm^–2. The cross-linking structure of the organic interlayer also inhibits ion migration paths and enhances stability with a small dark current drift as low as 4.93 × 10^–18 A cm^–1 V^–1 s^–1. The Cu(Gly)₂Pb₂Br₄ single crystal also shows good stability and X-ray imaging capability as a potential candidate for X-ray detection.

中文翻译：

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基于高电荷迁移率二维 Cu（Gly）2Pb2Br4 单晶的稳定硬 X 射线探测器


二维 （2D） 钙钛矿具有更好的长期稳定性、更好的离子迁移抑制能力，并且由于有机阳离子的阻碍作用，在 X 射线检测中具有较低的暗电流。然而，这也限制了电荷载流子传输并降低了器件灵敏度。在这里，我们报道了一种新的反式甘氨酸铜溴化铅 （Cu（Gly）₂Pb₂Br₄） 钙钛矿样单晶。通过金属离子的交联策略，Cu（Gly）₂Pb₂Br₄ 沿面外方向的电荷载流子传输能力大大提高。创纪录的 54.1 cm² V^–1 s^–1 空穴迁移率可实现 26 589 μC Gy_air^–1 cm^–2 的高灵敏度。有机夹层的交联结构还抑制了离子迁移路径，并在 10^–18 A cm^–1 V^–1 s^–1 的暗电流漂移下×低至 4.93 的小暗电流漂移中增强了稳定性。Cu（Gly）₂Pb₂Br₄ 单晶也显示出良好的稳定性和 X 射线成像能力，是 X 射线探测的潜在候选者。