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Atomic-level passivation mechanism of ammonium salts enabling highly efficient perovskite solar cells.

  • Alharbi EA Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Alyamani AY National Center for Nanotechnology, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia.
  • Kubicki DJ Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Uhl AR Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Walder BJ Laboratory of Magnetic Resonance, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Alanazi AQ Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Luo J Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Burgos-Caminal A Photochemical Dynamics Group, Institute of Chemical Sciences and Engineering, Lausanne Centre for Ultrafast Science, École polytechnique fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Albadri A National Center for Nanotechnology, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia.
  • Albrithen H National Center for Nanotechnology, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia.
  • Alotaibi MH National Center for Nanotechnology, King Abdulaziz City for Science and Technology, Riyadh, 11442, Saudi Arabia.
  • Moser JE Photochemical Dynamics Group, Institute of Chemical Sciences and Engineering, Lausanne Centre for Ultrafast Science, École polytechnique fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Zakeeruddin SM Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
  • Giordano F Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland. fabrizio.giordano@epfl.ch.
  • Emsley L Laboratory of Magnetic Resonance, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland. lyndon.emsley@epfl.ch.
  • Grätzel M Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland. michael.graetzel@epfl.ch.
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  • 2019-07-10
Published in:
  • Nature communications. - 2019
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy
General Chemistry
English The high conversion efficiency has made metal halide perovskite solar cells a real breakthrough in thin film photovoltaic technology in recent years. Here, we introduce a straightforward strategy to reduce the level of electronic defects present at the interface between the perovskite film and the hole transport layer by treating the perovskite surface with different types of ammonium salts, namely ethylammonium, imidazolium and guanidinium iodide. We use a triple cation perovskite formulation containing primarily formamidinium and small amounts of cesium and methylammonium. We find that this treatment boosts the power conversion efficiency from 20.5% for the control to 22.3%, 22.1%, and 21.0% for the devices treated with ethylammonium, imidazolium and guanidinium iodide, respectively. Best performing devices showed a loss in efficiency of only 5% under full sunlight intensity with maximum power tracking for 550 h. We apply 2D- solid-state NMR to unravel the atomic-level mechanism of this passivation effect.
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  • English
Open access status
gold
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https://sonar.ch/global/documents/104962
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