Intrinsic Halide Segregation at Nanometer Scale Determines the High Efficiency of Mixed Cation/Mixed Halide Perovskite Solar Cells.
- Gratia P Group for Molecular Engineering of Functional Materials (GMF), Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology , CH-1951 Sion, Switzerland.
- Grancini G Group for Molecular Engineering of Functional Materials (GMF), Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology , CH-1951 Sion, Switzerland.
- Audinot JN Advanced Instrumentation for Ion Nano-Analytics (AINA), Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST) , L-4422 Belvaux, Luxembourg.
- Jeanbourquin X Molecular Engineering of Optoelectronic Nanomaterials Lab (LIMNO), Swiss Federal Institute of Technology , CH 1015 Lausanne, Switzerland.
- Mosconi E Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM , Via Elce di Sotto 8, I-06123 Perugia, Italy.
- Zimmermann I Group for Molecular Engineering of Functional Materials (GMF), Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology , CH-1951 Sion, Switzerland.
- Dowsett D Advanced Instrumentation for Ion Nano-Analytics (AINA), Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST) , L-4422 Belvaux, Luxembourg.
- Lee Y Group for Molecular Engineering of Functional Materials (GMF), Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology , CH-1951 Sion, Switzerland.
- Grätzel M Laboratory for Photonics and Interfaces (LPI), Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology , CH-1015 Lausanne, Switzerland.
- De Angelis F Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM , Via Elce di Sotto 8, I-06123 Perugia, Italy.
- Sivula K Molecular Engineering of Optoelectronic Nanomaterials Lab (LIMNO), Swiss Federal Institute of Technology , CH 1015 Lausanne, Switzerland.
- Wirtz T Advanced Instrumentation for Ion Nano-Analytics (AINA), Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST) , L-4422 Belvaux, Luxembourg.
- Nazeeruddin MK Group for Molecular Engineering of Functional Materials (GMF), Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology , CH-1951 Sion, Switzerland.
- 2016-12-15
Published in:
- Journal of the American Chemical Society. - 2016
English
Compositional engineering of a mixed cation/mixed halide perovskite in the form of (FAPbI3)0.85(MAPbBr3)0.15 is one of the most effective strategies to obtain record-efficiency perovskite solar cells. However, the perovskite self-organization upon crystallization and the final elemental distribution, which are paramount for device optimization, are still poorly understood. Here we map the nanoscale charge carrier and elemental distribution of mixed perovskite films yielding 20% efficient devices. Combining a novel in-house-developed high-resolution helium ion microscope coupled with a secondary ion mass spectrometer (HIM-SIMS) with Kelvin probe force microscopy (KPFM), we demonstrate that part of the mixed perovskite film intrinsically segregates into iodide-rich perovskite nanodomains on a length scale of up to a few hundred nanometers. Thus, the homogeneity of the film is disrupted, leading to a variation in the optical properties at the micrometer scale. Our results provide unprecedented understanding of the nanoscale perovskite composition.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1021/jacs.6b10049
- PMID 27960332
- Persistent URL
- https://susi.usi.ch/global/documents/214686
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