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

Abstract 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 Pb 2 CuGly 2 X 4 (Gly = -O 2 C-CH 2 -NH 2 ; X = Cl, Br) single crystals (SCs), in which the adjacent lead halide layers are linked by large-sized Cu(Gly) 2 pillars, are synthesized in water. The Cu(Gly) 2 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 a ) of 1.06 eV. The Pb 2 CuGly 2 Cl 4 SC X-ray detector displays extremely low dark current drift of 1.20 × 10 –9 nA mm −1 s −1 V −1 under high electric field (120 V mm −1 ) and continuous X-ray irradiation (2.86 Gy), and a high sensitivity of 9,250 μC Gy −1 cm −2 is also achieved. More excitingly, the Pb 2 CuGly 2 Cl 4 nanocrystal can be easily dispersed in water and directly blade-coated on thin-film transistor (TFT) array substrate, and the obtained Pb 2 CuGly 2 Cl 4 -based TFT array detector offers an X-ray imaging capability with spatial resolution of 2.2 lp mm −1 .