The quality of the photoactive layer gravely affects the characteristics and stabilities of photovoltaic device. Here, by introducing polyethylene glycol (PEG) into the methylammonium lead trihalide (MAPbI₃) precursor solution, we fabricate high-quality MAPbI₃ perovskite film with high coverage and large grain size. By adjusting the PEG concentration into the perovskite film, the hole-conductor-free mesoporous perovskite solar cell with carbon electrode exhibits a boosted power conversion efficiency of 11.62%, which originates primarily from the enhancements of light absorption and acceleration of carriers transfer. Meanwhile, hygroscopic PEG protects the perovskite film from moisture, which leads to the perovskite film and corresponding device exhibit superior stability. This work confirms a high-efficiency and feasible strategy using polymer materials to enhance the performance in power conversion efficiency and stability of perovskite solar cells.

光敏层的质量严重影响光伏器件的特性和稳定性。在这里，通过将聚乙二醇（PEG）引入甲基铵三卤化铅（MAPbI ₃）前体溶液中，我们可以制造出高质量的MAPbI ₃高覆盖率和大晶粒尺寸的钙钛矿薄膜。通过调节进入钙钛矿薄膜中的PEG浓度，带有碳电极的无孔导体的介孔钙钛矿太阳能电池的功率转换效率提高了11.62％，这主要是由于光吸收的增强和载流子传输的加速。同时，吸湿性PEG保护钙钛矿膜免受潮气，导致钙钛矿膜和相应的装置表现出优异的稳定性。这项工作证实了使用聚合物材料提高钙钛矿型太阳能电池的功率转换效率和稳定性能的高效可行的策略。