Photophysics of Two-Dimensional Perovskites—Learning from Metal Halide Substitution
Authors
Adjokatse, S
Publication Date
2021-11Journal Title
Advanced Functional Materials
ISSN
1616-301X
Publisher
Wiley
Volume
31
Issue
46
Language
en
Type
Article
This Version
AO
VoR
Metadata
Show full item recordCitation
Kahmann, S., Duim, H., Fang, H., Dyksik, M., Adjokatse, S., Rivera Medina, M., Pitaro, M., et al. (2021). Photophysics of Two-Dimensional Perovskites—Learning from Metal Halide Substitution. Advanced Functional Materials, 31 (46) https://doi.org/10.1002/adfm.202103778
Abstract
Whereas their photophysics exhibits an intricate interplay of carriers with
the lattice, most reports have so far relied on single compound studies. With
the exception of variations of the organic spacer cations, the effect of
constituent substitution on the photophysics and the nature of emitting
species, in particular, has remained largely under-explored. Here
PEA$_2$PbBr$_4$, PEA$_2$PbI$_4$, and PEA$_2$SnI$_4$ are studied through a
variety of optical spectroscopy techniques to reveal a complex set of excitonic
transitions at low temperature. We attribute the emergence of weak high energy
features to a vibronic progression breaking Kasha's rule and highlight that the
responsible phonons cannot be accessed through simple Raman spectroscopy.
Bright peaks at lower energy are due to two distinct excitons, of which the
upper is a convolution of a bright exciton and a localised state, whereas the
lower is attributed to shallow defects. Our study offers deeper insights into
the photophysics of two-dimensional perovskites through compositional
substitution and highlights critical limits to the communities' current
understanding of the photophysics of these compounds.
Keywords
Research Article, Research Articles, 2D perovskites, defects, excitons, magneto‐photoluminescence, photophysics, Ruddlesden‐Popper phases
Sponsorship
Deutsche Forschungsgemeinschaft (408012143)
Dutch Research Council (739.017.005)
National Science Centre Poland (2019/33/B/ST3/01915)
Polish NAtional Agency for Academic Exchange (PPN/BEK/2019/1/00312/U/00001)
Ministry of Science and Higher Education Poland (DIR/WK/2018/07)
Identifiers
adfm202103778
External DOI: https://doi.org/10.1002/adfm.202103778
This record's URL: https://www.repository.cam.ac.uk/handle/1810/330589
Rights
Licence:
http://creativecommons.org/licenses/by-nc-nd/4.0/
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