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Crown Ether Modulation Enables over 23% Efficient Formamidinium-Based Perovskite Solar Cells.

Authors
  • Su, Tzu-Sen1, 2
  • Eickemeyer, Felix Thomas1, 3
  • Hope, Michael A4
  • Jahanbakhshi, Farzaneh5
  • Mladenović, Marko5
  • Li, Jun1
  • Zhou, Zhiwen1
  • Mishra, Aditya4
  • Yum, Jun-Ho6
  • Ren, Dan1
  • Krishna, Anurag3
  • Ouellette, Olivier1
  • Wei, Tzu-Chien2
  • Zhou, Hua7
  • Huang, Hsin-Hsiang8
  • Mensi, Mounir Driss9
  • Sivula, Kevin6
  • Zakeeruddin, Shaik M1
  • Milić, Jovana V1
  • Hagfeldt, Anders3
  • And 4 more
  • 1 Laboratory of Photonics and Interfaces, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland. , (Switzerland)
  • 2 Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan. , (Taiwan)
  • 3 Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland. , (Switzerland)
  • 4 Laboratory of Magnetic Resonance, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland. , (Switzerland)
  • 5 Laboratory of Computational Chemistry and Biochemistry, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland. , (Switzerland)
  • 6 Laboratory of Molecular Engineering of Optoelectronic Nanomaterials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland. , (Switzerland)
  • 7 Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States. , (United States)
  • 8 Materials Science Division and Center for Molecular Engineering, Argonne National Laboratory, Lemont, Illinois 60439, United States. , (United States)
  • 9 Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Valais Wallis, CH-1951 Sion, Switzerland. , (Switzerland)
Type
Published Article
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society
Publication Date
Nov 25, 2020
Volume
142
Issue
47
Pages
19980–19991
Identifiers
DOI: 10.1021/jacs.0c08592
PMID: 33170007
Source
Medline
Language
English
License
Unknown

Abstract

The use of molecular modulators to reduce the defect density at the surface and grain boundaries of perovskite materials has been demonstrated to be an effective approach to enhance the photovoltaic performance and device stability of perovskite solar cells. Herein, we employ crown ethers to modulate perovskite films, affording passivation of undercoordinated surface defects. This interaction has been elucidated by solid-state nuclear magnetic resonance and density functional theory calculations. The crown ether hosts induce the formation of host-guest complexes on the surface of the perovskite films, which reduces the concentration of surface electronic defects and suppresses nonradiative recombination by 40%, while minimizing moisture permeation. As a result, we achieved substantially improved photovoltaic performance with power conversion efficiencies exceeding 23%, accompanied by enhanced stability under ambient and operational conditions. This work opens a new avenue to improve the performance and stability of perovskite-based optoelectronic devices through supramolecular chemistry.

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