Zhang Zimin, Wang Xiaoli, Li Huayang, Li Dong, Zhang Yang, Shen Nan, Yu Xue-Feng, Liu Yucheng, Liu Shengzhong, Song Haomin, Liu Yanliang, Wang Xingzhu, Chen Shi
Henan Key Laboratory of Quantum Materials and Quantum Energy, School of Future Technology, Henan University, Zhengzhou, 450046, People's Republic of China.
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, 518055, People's Republic of China.
Nanomicro Lett. 2025 Jun 23;17(1):310. doi: 10.1007/s40820-025-01788-z.
Although three-dimensional metal halide perovskites are promising candidates for direct X-ray detection, the ion migration of perovskites seriously affects the detector stability. Herein, face-/edge-shared 3D heterometallic glycinate hybrid perovskitoid PbCuGlyX (Gly = -OC-CH-NH; X = Cl, Br) single crystals (SCs), in which the adjacent lead halide layers are linked by large-sized Cu(Gly) pillars, are synthesized in water. The Cu(Gly) pillars in combination with face-/edge-shared inorganic skeleton are found able to synergistically suppress the ion migration, delivering a high ion migration activation energy (E) of 1.06 eV. The PbCuGlyCl SC X-ray detector displays extremely low dark current drift of 1.20 × 10 nA mm s V under high electric field (120 V mm) and continuous X-ray irradiation (2.86 Gy), and a high sensitivity of 9,250 μC Gy cm is also achieved. More excitingly, the PbCuGlyCl nanocrystal can be easily dispersed in water and directly blade-coated on thin-film transistor (TFT) array substrate, and the obtained PbCuGlyCl-based TFT array detector offers an X-ray imaging capability with spatial resolution of 2.2 lp mm.
尽管三维金属卤化物钙钛矿是直接X射线检测的有前途的候选材料，但钙钛矿的离子迁移严重影响探测器的稳定性。在此，通过在水中合成了面/边共享的3D异金属甘氨酸酯杂化钙钛矿型PbCuGlyX（Gly = -OC-CH-NH；X = Cl，Br）单晶（SCs），其中相邻的卤化铅层通过大型Cu（Gly）柱连接。发现Cu（Gly）柱与面/边共享的无机骨架相结合能够协同抑制离子迁移，提供1.06 eV的高离子迁移活化能（E）。PbCuGlyCl SC X射线探测器在高电场（120 V/mm）和连续X射线照射（2.86 Gy）下显示出极低的暗电流漂移，为1.20×10 nA mm s V，并且还实现了9250 μC Gy cm的高灵敏度。更令人兴奋的是，PbCuGlyCl纳米晶体可以很容易地分散在水中并直接刮刀涂覆在薄膜晶体管（TFT）阵列基板上，并且所获得的基于PbCuGlyCl的TFT阵列探测器具有2.2 lp/mm的空间分辨率的X射线成像能力。
