You, ShuaiZeng, HaipengLiu, YuhangHan, BingLi, MinLi, LinZheng, XinGuo, RuiLuo, LongLi, ZheZhang, ChiLiu, RanranZhao, YangZhang, ShujingPeng, QiWang, TiChen, QiEickemeyer, Felix T.Carlsen, BrianZakeeruddin, Shaik M.Mai, LiqiangRong, YaoguangGratzel, MichaelLi, Xiong2023-04-102023-04-102023-04-102023-01-2010.1126/science.add8786https://infoscience.epfl.ch/handle/20.500.14299/196864WOS:000928329800032High-quality perovskite light harvesters and robust organic hole extraction layers are essential for achieving high-performing perovskite solar cells (PSCs). We introduce a phosphonic acid???functionalized fullerene derivative in mixed-cation perovskites as a grain boundary modulator to consolidate the crystal structure, which enhances the tolerance of the film against illumination, heat, and moisture. We also developed a redox-active radical polymer, poly(oxoammonium salt), that can effectively p-dope the hole-transporting material by hole injection and that also mitigates lithium ion diffusion. Power conversion efficiencies of 23.5% for 1-square-centimeter mixed???cation-anion PSCs and 21.4% for 17.1-square-centimeter minimodules were achieved. The PSCs retained 95.5% of their initial efficiencies after 3265 hours at maximum power point tracking under continuous 1-sun illumination at 70?? ?? 5??C.Multidisciplinary SciencesScience & Technology - Other Topicscellsperformancehysteresisstabilityimpactgrowthfilmstext::journal::journal article::research article