Thanks to its strong X-ray absorption and large carrier diffusion length, perovskites have demonstrated excellent performance for X-ray detection. Combination of perovskite with thin-film transistor (TFT) arrays to construct flat-panel X-ray imager (FPXI) is required for X-ray imaging, yet this is rarely reported. Solution processing of perovskite thick film onto TFT can enable the electronic connection, however the amounts of pinholes inevitably form during the solvent evaporation and result in a porous film with deteriorated performance and stability. Here a novel strategy is raised to achieve high-quality perovskite thick films for TFT integration via soft-pressing and in situ polymerization of multi-functional binder (TMTA). The combined process largely eliminates the pinholes, improves the surface smoothness, passivates grains boundaries, reduces ionic migration, and improves stability. Accordingly, a compact and smooth MAPbI₃ thick film integrating with TFT arrays is prepared for flat-panel X-ray imaging. The largest film (28 × 28 cm²) is obtained with the state-of-the-art performance (ratio of sensitivity to noise current: 1.41 × 10¹¹ µC Gy⁻¹ A⁻¹) among polycrystalline films. It is hoped that the work provides guidance for fabricating compact perovskite thick films and push perovskite FPXI one step further for low-dose X-ray imaging.

中文翻译：

---

通过用于平板 X 射线成像仪的软压和多功能可聚合粘合剂实现紧凑和大面积的钙钛矿薄膜

由于其强的 X 射线吸收和较大的载流子扩散长度，钙钛矿在 X 射线检测方面表现出优异的性能。X 射线成像需要钙钛矿与薄膜晶体管 (TFT) 阵列相结合来构建平板 X 射线成像仪 (FPXI)，但这很少见报道。将钙钛矿厚膜溶液处理到TFT上可以实现电子连接，但是在溶剂蒸发过程中不可避免地会形成大量针孔，导致多孔膜的性能和稳定性下降。在这里，提出了一种新的策略，通过软压和多功能粘合剂（TMTA）的原位聚合来实现用于 TFT 集成的高质量钙钛矿厚膜。该组合工艺在很大程度上消除了针孔，提高了表面光滑度，钝化了晶界，减少离子迁移，提高稳定性。因此，一个紧凑而光滑的 MAPbI为平板X射线成像准备了与TFT阵列集成的_3厚膜。在多晶薄膜中，最大的薄膜（28 × 28 cm ²）具有最先进的性能（对噪声电流的灵敏度比：1.41 × 10 ¹¹ µC Gy ^-1 A ^{-1 ）。}希望这项工作为制备致密的钙钛矿厚膜提供指导，并推动钙钛矿FPXI在低剂量X射线成像方面更进一步。