Each component layer in a perovskite solar cell plays an important role in the cell performance. Here, a few types of polymers including representative p‐type and n‐type semiconductors, and a classical insulator, are chosen to dope into a perovskite film. The long‐chain polymer helps to form a network among the perovskite crystalline grains, as witnessed by the improved film morphology and device stability. The dewetting process is greatly suppressed by the cross‐linking effect of the polymer chains, thereby resulting in uniform perovskite films with large grain sizes. Moreover, it is found that the polymer‐doped perovskite shows a reduced trap‐state density, likely due to the polymer effectively passivating the perovskite grain surface. Meanwhile the doped polymer formed a bridge between grains for efficient charge transport. Using this approach, the solar cell efficiency is improved from 17.43% to as high as 19.19%, with a much improved stability. As it is not required for the polymer to have a strict energy level matching with the perovskite, in principle, one may use a variety of polymers for this type of device design.

中文翻译：

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用于高钙钛矿型太阳能电池的聚合物掺杂，具有改善的水分稳定性

钙钛矿太阳能电池中的每个组成层在电池性能中都起着重要作用。在这里，选择了几种类型的聚合物，包括代表性的p型和n型半导体，以及经典的绝缘体，以掺杂到钙钛矿薄膜中。长链聚合物有助于在钙钛矿晶粒之间形成网状结构，改善的膜形态和器件稳定性证明了这一点。聚合物链的交联作用极大地抑制了脱湿过程，从而形成了具有大晶粒尺寸的均匀钙钛矿薄膜。此外，发现掺杂聚合物的钙钛矿显示出降低的陷阱态密度，这可能是由于聚合物有效地钝化了钙钛矿晶粒表面。同时，掺杂的聚合物形成了晶粒之间的桥，从而实现了有效的电荷传输。使用这种方法，太阳能电池效率从17.43％提高到19.19％，稳定性大大提高。由于不需要聚合物具有与钙钛矿严格的能级匹配，因此原则上可以将多种聚合物用于这种类型的装置设计。