Face-/Edge-Shared 3D Perovskitoid Single Crystals with Suppressed Ion Migration for Stable X-Ray Detector.

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.