Ultrahydrophobic 3D/2D fluoroarene bilayer-based water-resistant perovskite solar cells with efficiencies exceeding 22%

作者：Yuhang Liu, Seçkin Akın, Linfeng Pan, Ryusuke Uchida, Neha Arora, Jovana V. Milić, Alexander Hinderhofer, Frank Schreiber, Alexander R. Uhl, Shaik M. Zakeeruddin, Anders Hagfeldt, M. Ibrahim Dar, Michaël Grätzel · 发表于：Science Advances · 年份：2019 · DOI：10.1126/sciadv.aaw2543 · 被引用次数：709 · 研究领域：Perovskite Materials and Applications

perovskite layer using pentafluorophenylethylammonium (FEA) as a fluoroarene cation inserted between the 3D light-harvesting perovskite film and the hole-transporting material (HTM). The perfluorinated benzene moiety confers an ultrahydrophobic character to the spacer layer, protecting the perovskite light-harvesting material from ambient moisture while mitigating ionic diffusion in the device. Unsealed 3D/2D PSCs retain 90% of their efficiency during photovoltaic operation for 1000 hours in humid air under simulated sunlight. Remarkably, the 2D layer also enhances interfacial hole extraction, suppressing nonradiative carrier recombination and enabling a power conversion efficiency (PCE) >22%, the highest reported for 3D/2D architectures. Our new approach provides water- and heat-resistant operationally stable PSCs with a record-level PCE.