Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, International Joint Research Center of Shaanxi Province for Photoelectric Materials Science, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China.
Adv Mater. 2023 Feb;35(7):e2208875. doi: 10.1002/adma.202208875. Epub 2022 Dec 19.
2D Dion-Jacobson (DJ) perovskite single crystals (PSCs) usually demonstrate better X-ray detection performance than Ruddlesden-Popper (RP) PSCs. However, the mechanism of the improved performance is still elusive. Here, by the aid of strong interactions between dimethylbiguanide (DGA) and PbI , a novel DJ-perovskitoid (DGA)PbI is designed. From the comparison of (DGA)PbI to other 2D PSCs, it is discovered that the tiniest lattice distortion and increased hydrogen bonds in the atom-scaled analysis strengthen lattice rigidity and weaken electron-phonon coupling to suppress disordered scattering of carriers, resulting in significantly improved carrier transport and stability. Therefore, high carrier mobility (78.1 cm V s ) and a pronounced sensitivity of 4869.0 µC Gy cm are achieved using (DGA)PbI , which are the best in 2D Pb-based PSC devices to date. Finally, the (DGA)PbI devices exhibit good spatial resolution in X-ray imaging and excellent long-term stability to work as a promising candidate for medical diagnostics and nondestructive determination.
2D 二酮腙盐(DJ)钙钛矿单晶(PSCs)通常比 Ruddlesden-Popper (RP) PSCs 具有更好的 X 射线检测性能。然而，其性能提高的机制仍难以捉摸。在这里，通过二甲双胍(DGA)和 PbI 之间的强相互作用，设计了一种新型的 DJ 钙钛矿( DGA)PbI。通过(DGA)PbI 与其他 2D PSCs 的比较，发现原子尺度分析中最小的晶格畸变和增加的氢键增强了晶格的刚性，削弱了电子-声子耦合，抑制了载流子的无序散射，从而显著提高了载流子的输运和稳定性。因此，(DGA)PbI 实现了高达 78.1 cm V s 的高载流子迁移率和显著的灵敏度 4869.0 µC Gy cm ，这是迄今为止 2D Pb 基 PSC 器件中的最佳性能。最后，(DGA)PbI 器件在 X 射线成像中表现出良好的空间分辨率和优异的长期稳定性，有望成为医学诊断和无损检测的候选材料。
