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

Yuhang Liu(École Polytechnique Fédérale de Lausanne), Seçkin Akın(Karamanoğlu Mehmetbey University), Linfeng Pan(École Polytechnique Fédérale de Lausanne), Ryusuke Uchida(Panasonic (Japan)), Neha Arora(École Polytechnique Fédérale de Lausanne), Jovana V. Milić(École Polytechnique Fédérale de Lausanne), Alexander Hinderhofer(University of Tübingen), Frank Schreiber(University of Tübingen), Alexander R. Uhl(École Polytechnique Fédérale de Lausanne), Shaik M. Zakeeruddin(École Polytechnique Fédérale de Lausanne), Anders Hagfeldt(École Polytechnique Fédérale de Lausanne), M. Ibrahim Dar(École Polytechnique Fédérale de Lausanne), Michaël Grätzel(École Polytechnique Fédérale de Lausanne)
Science Advances
June 1, 2019
10.1126/sciadv.aaw2543
Cited by 693Open Access
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Abstract

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.

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