The exploitation of methylammonium lead iodide perovskite-polymer composites is a promising strategy for the preparation of photoactive thin layers for solar cells. The preparation of these composites is a simple fabrication method with improved moisture stability when compared to that of pristine perovskite films. To deepen the understanding of the charge transport properties of these films, we investigated charge carrier mobility, traps, and ion migration. For this purpose, we applied a combinatory measurement approach that proves how such composites can still retain an ambipolar charge transport nature and the same mobility values of the related perovskite. Furthermore, thermally stimulated current measurements revealed that the polymer influenced the creation of additional defects during film formation without affecting charge mobility. Finally, impedance spectroscopy measurements suggested the addition of starch may hinder ion migration, which would require larger activation energies to move ions in composite films. These results pave the way for new strategies of polymer-assisted perovskite film development.

甲基铵碘化铅钙钛矿-聚合物复合材料的开发是制备太阳能电池光敏薄层的一种很有前景的策略。与原始钙钛矿薄膜相比，这些复合材料的制备是一种简单的制造方法，具有更高的水分稳定性。为了加深对这些薄膜电荷传输特性的理解，我们研究了电荷载流子迁移率、陷阱和离子迁移。为此，我们应用了一种组合测量方法，以证明此类复合材料如何仍能保持相关钙钛矿的双极性电荷传输性质和相同的迁移率值。此外，热刺激电流测量表明，聚合物会影响成膜过程中额外缺陷的产生，而不会影响电荷迁移率。最后，阻抗谱测量表明添加淀粉可能会阻碍离子迁移，这将需要更大的活化能来移动复合膜中的离子。这些结果为聚合物辅助钙钛矿薄膜开发的新策略铺平了道路。