Perovskite materials are promising candidates for the next generation of wearable optoelectronics. However, due to uncontrolled crystallization and the natural brittle property of crystals, it remains a great challenge to fabricate large-scale compact and tough perovskite film. Here we report a facile method to print large-scale perovskite films with high quality for flexible photodetectors. By introducing a soluble polyethylene oxide (PEO) layer during the inkjet printing process, the nucleation and crystal growth of perovskite is well controlled. Perovskite films can be easily printed in large scale and patterned in high resolution. Moreover, this method can be extended to various kinds of perovskite materials, such as MAPbI₃ (MA = methylammonium), MA₃Sb₂I₉, and (BA)₂PbBr₄ (BA = benzylammonium). The printed perovskite films show high quality and excellent mechanical performance. The photodetectors based on the MAPbBr₃ perovskite films show a responsivity up to ∼ 1,036 mA/W and maintain over 96.8% of the initial photocurrent after 15,000 consecutive bending cycles. This strategy provides a facile approach to prepare large-scale flexible perovskite films. It opens up new opportunities for the fabrication of diverse wearable optoelectronic devices.

钙钛矿材料是下一代可穿戴光电的有希望的候选材料。然而，由于不受控制的结晶和晶体的天然脆性，制造大规模致密且坚韧的钙钛矿薄膜仍然是一个巨大的挑战。在这里，我们报告了一种简便的方法，可以为柔性光电探测器打印高质量的大规模钙钛矿薄膜。通过在喷墨打印过程中引入可溶性聚环氧乙烷 (PEO) 层，钙钛矿的成核和晶体生长得到很好的控制。钙钛矿薄膜可以很容易地大规模印刷并以高分辨率图案化。此外，该方法可以扩展到各种钙钛矿材料，如MAPbI ₃ (MA =甲基铵)、MA ₃ Sb ₂ I₉，和(BA) ₂ PbBr ₄ (BA=苄基铵)。印刷的钙钛矿薄膜显示出高质量和优异的机械性能。基于 MAPbBr ₃钙钛矿薄膜的光电探测器显示出高达 1,036 mA/W 的响应度，并在 15,000 次连续弯曲循环后保持超过 96.8% 的初始光电流。该策略为制备大规模柔性钙钛矿薄膜提供了一种简便的方法。它为制造各种可穿戴光电设备开辟了新的机会。