articleScience AdvancesJun 1, 2019GOLD OA

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

YLYuhang LiuSASeçkin AkınLPLinfeng PanRURyusuke UchidaNANeha Arora

École Polytechnique Fédérale de Lausanne · Karamanoğlu Mehmetbey University · +2 more institutions

PubMed
Indexed incrossrefdoajpubmed

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…

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692
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Authors

13

Topics & keywords

Topics
Keywords
  • Materials science
  • Perovskite (structure)
  • Energy conversion efficiency
  • Moisture
  • Bilayer
  • Layer (electronics)
  • Photovoltaic system
  • Diffusion
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