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

Science advances, 2019-06, Vol.5 (6), p.eaaw2543-eaaw2543 [Peer Reviewed Journal]

Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). 2019 The Authors ;ISSN: 2375-2548 ;EISSN: 2375-2548 ;DOI: 10.1126/sciadv.aaw2543 ;PMID: 31187060

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  • Title:
    Ultrahydrophobic 3D/2D fluoroarene bilayer-based water-resistant perovskite solar cells with efficiencies exceeding 22
  • Author: Liu, Yuhang ; Akin, Seckin ; Pan, Linfeng ; Uchida, Ryusuke ; Arora, Neha ; Milić, Jovana V ; Hinderhofer, Alexander ; Schreiber, Frank ; Uhl, Alexander R ; Zakeeruddin, Shaik M ; Hagfeldt, Anders ; Dar, M Ibrahim ; Grätzel, Michael
  • Subjects: Materials Science ; SciAdv r-articles
  • Is Part Of: Science advances, 2019-06, Vol.5 (6), p.eaaw2543-eaaw2543
  • Description: Preventing the degradation of metal perovskite solar cells (PSCs) by humid air poses a substantial challenge for their future deployment. We introduce here a two-dimensional (2D) A PbI 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.
  • Publisher: United States: American Association for the Advancement of Science
  • Language: English
  • Identifier: ISSN: 2375-2548
    EISSN: 2375-2548
    DOI: 10.1126/sciadv.aaw2543
    PMID: 31187060
  • Source: Open Access: DOAJ Directory of Open Access Journals
    Open Access: PubMed Central
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