Heterogeneous Integration of Compact Perovskite Films on Pixelated Arrays via Solid‐State Crystal Growth for X‐Ray Imaging

Abstract Metal halide perovskites are promising candidates for direct X‐ray imaging, but their heterogeneous integration with pixelated sensing arrays remains challenging. Herein, a novel solid‐state crystal growth strategy to integrate high‐quality perovskites with the pixelated electrode substrate for X‐ray imaging is described, and the soft methylammonium lead triiodide solvate (MAPbI 3 •DMF) powder is utilized as precursor and is soft‐pressed directly on the thin film transistor (TFT) array at moderate pressure and temperature (100 °C, 0.8 MPa) instead of common perovskite suspension printing. A compact and dense MAPbI 3 thick film is obtained with excellent mobility‐lifetime ( µτ ) of 1.92 × 10 −3 cm 2 •V −1 . The X‐ray detector shows a high sensitivity of 40,970 µC•Gy air −1 •cm −2 and a low detection limit of 14.3 nGy air •s −1 . In addition, the TFT perovskite X‐ray flat‐panel exhibits a well‐distributed pixel response and high spatial resolution of 0.6 lp•pixel −1 for X‐ray imaging.