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Spectral shifts upon halide segregation in perovskite nanocrystals observed via transient absorption spectroscopy

Published online by Cambridge University Press:  14 July 2020

Michael L. Crawford Open the ORCID record for Michael L. Crawford [Opens in a new window] ,
James C. Sadighian Open the ORCID record for James C. Sadighian [Opens in a new window] ,
Yasser Hassan ,
Henry J. Snaith  and
Cathy Y. Wong Open the ORCID record for Cathy Y. Wong [Opens in a new window]
Michael L. Crawford
Affiliation:
Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon97403, USA
James C. Sadighian
Affiliation:
Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon97403, USA
Yasser Hassan
Affiliation:
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, OxfordOX1 3PU, UK
Henry J. Snaith
Affiliation:
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, OxfordOX1 3PU, UK
Cathy Y. Wong
Affiliation:
Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon97403, USA Oregon Center for Optical, Molecular, and Quantum Science, University of Oregon, Eugene, Oregon97403, USA Materials Science Institute, University of Oregon, Eugene, Oregon97403, USA
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Abstract

Lead halide perovskite nanocrystals (NCs) are promising for applications in light emitting devices owing to a strong emission spectrum that is tunable throughout the visible region by altering halide composition. However, in mixed-halide perovskite systems photoinduced migration drives formation of halide-segregated domains, altering the emission spectrum. The mechanism by which this segregation occurs is currently the subject of intense investigation. Processes involving the perovskite surface are expected to be of enhanced prevalence in NCs due to their large surface area to volume ratio. In this work, we use transient absorption spectroscopy to probe the excited-state dynamics of NCs before and after halide segregation. Comparison of global fit spectra of the measured signals suggests the accumulation of iodide at the surface, resulting in a redshifted emission spectrum.

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Articles
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MRS Advances , Volume 5 , Issue 51: Characterization and Theory , 2020 , pp. 2613 - 2621
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Copyright
Copyright © Materials Research Society 2020

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