Here, we sucessfully demonstrate the continuous functionalization of grain boundaries (GBs) in CH₃NH₃PbI₃ (MAPbI₃) organic-inorganic halide perovskite (OIHP) thin films with a triblock copolymer that contains rationally selected hydrophilic-hydrophobic-hydrophilic symmetric blocks. The addition of the triblock copolymer into the precursor solution assists in perovskite solution crystallization, resulting in ultrasmooth thin films with GB regions that are continuously functionalized. Tuning of the thickness of the functionalized GBs is realized, leading to MAPbI₃ OIHP thin films with simultaneously enhanced optoelectronic properties and environmental (thermal, moisture, and light) stability. The resulting perovskite solar cells show high stabilized efficiency of 19.4%, most of which is retained (92%) upon 480-hr 1-sun illumination. This approach is generic in nature, and it can be extended to a wide range of OIHPs and beyond.

在这里，我们成功地证明CH晶粒边界（GBS）的连续官能化₃ NH ₃碘化铅₃（MAPbI ₃）有机-无机卤化物钙钛矿（OIHP）薄膜用的三嵌段共聚物，其包含合理地选择亲水-疏水-亲水对称块。将三嵌段共聚物添加到前体溶液中有助于钙钛矿溶液的结晶，从而得到具有连续功能化的GB区域的超光滑薄膜。实现了功能化GB厚度的调整，从而产生了MAPbI ₃OIHP薄膜同时具有增强的光电性能和环境（热，湿气和光）稳定性。所得钙钛矿太阳能电池显示出19.4％的高稳定化效率，在480小时的1个太阳照射下，大部分保持不变（92％）。这种方法本质上是通用的，可以扩展到广泛的OIHP，甚至更多。