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Controlling Intrinsic Quantum Confinement in Formamidinium Lead Triiodide Perovskite through Cs Substitution

[Image: see text] Lead halide perovskites are leading candidates for photovoltaic and light-emitting devices, owing to their excellent and widely tunable optoelectronic properties. Nanostructure control has been central to their development, allowing for improvements in efficiency and stability, and...

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Autores principales: Elmestekawy, Karim A., Wright, Adam D., Lohmann, Kilian B., Borchert, Juliane, Johnston, Michael B., Herz, Laura M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9245356/
https://www.ncbi.nlm.nih.gov/pubmed/35609245
http://dx.doi.org/10.1021/acsnano.2c02970
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author Elmestekawy, Karim A.
Wright, Adam D.
Lohmann, Kilian B.
Borchert, Juliane
Johnston, Michael B.
Herz, Laura M.
author_facet Elmestekawy, Karim A.
Wright, Adam D.
Lohmann, Kilian B.
Borchert, Juliane
Johnston, Michael B.
Herz, Laura M.
author_sort Elmestekawy, Karim A.
collection PubMed
description [Image: see text] Lead halide perovskites are leading candidates for photovoltaic and light-emitting devices, owing to their excellent and widely tunable optoelectronic properties. Nanostructure control has been central to their development, allowing for improvements in efficiency and stability, and changes in electronic dimensionality. Recently, formamidinium lead triiodide (FAPbI(3)) has been shown to exhibit intrinsic quantum confinement effects in nominally bulk thin films, apparent through above-bandgap absorption peaks. Here, we show that such nanoscale electronic effects can be controlled through partial replacement of the FA cation with Cs. We find that Cs-cation exchange causes a weakening of quantum confinement in the perovskite, arising from changes in the bandstructure, the length scale of confinement, or the presence of δ(H)-phase electronic barriers. We further observe photon emission from quantum-confined regions, highlighting their potential usefulness to light-emitting devices and single-photon sources. Overall, controlling this intriguing quantum phenomenon will allow for its suppression or enhancement according to need.
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spelling pubmed-92453562022-07-01 Controlling Intrinsic Quantum Confinement in Formamidinium Lead Triiodide Perovskite through Cs Substitution Elmestekawy, Karim A. Wright, Adam D. Lohmann, Kilian B. Borchert, Juliane Johnston, Michael B. Herz, Laura M. ACS Nano [Image: see text] Lead halide perovskites are leading candidates for photovoltaic and light-emitting devices, owing to their excellent and widely tunable optoelectronic properties. Nanostructure control has been central to their development, allowing for improvements in efficiency and stability, and changes in electronic dimensionality. Recently, formamidinium lead triiodide (FAPbI(3)) has been shown to exhibit intrinsic quantum confinement effects in nominally bulk thin films, apparent through above-bandgap absorption peaks. Here, we show that such nanoscale electronic effects can be controlled through partial replacement of the FA cation with Cs. We find that Cs-cation exchange causes a weakening of quantum confinement in the perovskite, arising from changes in the bandstructure, the length scale of confinement, or the presence of δ(H)-phase electronic barriers. We further observe photon emission from quantum-confined regions, highlighting their potential usefulness to light-emitting devices and single-photon sources. Overall, controlling this intriguing quantum phenomenon will allow for its suppression or enhancement according to need. American Chemical Society 2022-05-24 2022-06-28 /pmc/articles/PMC9245356/ /pubmed/35609245 http://dx.doi.org/10.1021/acsnano.2c02970 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Elmestekawy, Karim A.
Wright, Adam D.
Lohmann, Kilian B.
Borchert, Juliane
Johnston, Michael B.
Herz, Laura M.
Controlling Intrinsic Quantum Confinement in Formamidinium Lead Triiodide Perovskite through Cs Substitution
title Controlling Intrinsic Quantum Confinement in Formamidinium Lead Triiodide Perovskite through Cs Substitution
title_full Controlling Intrinsic Quantum Confinement in Formamidinium Lead Triiodide Perovskite through Cs Substitution
title_fullStr Controlling Intrinsic Quantum Confinement in Formamidinium Lead Triiodide Perovskite through Cs Substitution
title_full_unstemmed Controlling Intrinsic Quantum Confinement in Formamidinium Lead Triiodide Perovskite through Cs Substitution
title_short Controlling Intrinsic Quantum Confinement in Formamidinium Lead Triiodide Perovskite through Cs Substitution
title_sort controlling intrinsic quantum confinement in formamidinium lead triiodide perovskite through cs substitution
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9245356/
https://www.ncbi.nlm.nih.gov/pubmed/35609245
http://dx.doi.org/10.1021/acsnano.2c02970
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