Spatiotemporal Mapping Uncouples Exciton Diffusion from Singlet–Singlet Annihilation in the Electron Acceptor Y6

[Image: see text] Understanding the spatial dynamics of nanoscale exciton transport beyond the temporal decay is essential for further improvements of nanostructured optoelectronic devices, such as solar cells. The diffusion coefficient (D) of the nonfullerene electron acceptor Y6 has so far only be...

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Autores principales: Lo Gerfo M., Giulia, Bolzonello, Luca, Bernal-Texca, Francisco, Martorell, Jordi, van Hulst, Niek F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9940293/
https://www.ncbi.nlm.nih.gov/pubmed/36794828
http://dx.doi.org/10.1021/acs.jpclett.2c03585
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author Lo Gerfo M., Giulia
Bolzonello, Luca
Bernal-Texca, Francisco
Martorell, Jordi
van Hulst, Niek F.
author_facet Lo Gerfo M., Giulia
Bolzonello, Luca
Bernal-Texca, Francisco
Martorell, Jordi
van Hulst, Niek F.
author_sort Lo Gerfo M., Giulia
collection PubMed
description [Image: see text] Understanding the spatial dynamics of nanoscale exciton transport beyond the temporal decay is essential for further improvements of nanostructured optoelectronic devices, such as solar cells. The diffusion coefficient (D) of the nonfullerene electron acceptor Y6 has so far only been determined indirectly, from singlet–singlet annihilation (SSA) experiments. Here, we present the full picture of the exciton dynamics, adding the spatial domain to the temporal one, by spatiotemporally resolved photoluminescence microscopy. In this way, we directly track diffusion and we are able to decouple the real spatial broadening from its overestimation given by SSA. We measured the diffusion coefficient, D = 0.017 ± 0.003 cm(2)/s, which gives a Y6 film diffusion length of [Image: see text] nm. Thus, we provide an essential tool that enables a direct and free-of-artifacts determination of diffusion coefficients, which we expect to be pivotal for further studies on exciton dynamics in energy materials.
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spelling pubmed-99402932023-02-21 Spatiotemporal Mapping Uncouples Exciton Diffusion from Singlet–Singlet Annihilation in the Electron Acceptor Y6 Lo Gerfo M., Giulia Bolzonello, Luca Bernal-Texca, Francisco Martorell, Jordi van Hulst, Niek F. J Phys Chem Lett [Image: see text] Understanding the spatial dynamics of nanoscale exciton transport beyond the temporal decay is essential for further improvements of nanostructured optoelectronic devices, such as solar cells. The diffusion coefficient (D) of the nonfullerene electron acceptor Y6 has so far only been determined indirectly, from singlet–singlet annihilation (SSA) experiments. Here, we present the full picture of the exciton dynamics, adding the spatial domain to the temporal one, by spatiotemporally resolved photoluminescence microscopy. In this way, we directly track diffusion and we are able to decouple the real spatial broadening from its overestimation given by SSA. We measured the diffusion coefficient, D = 0.017 ± 0.003 cm(2)/s, which gives a Y6 film diffusion length of [Image: see text] nm. Thus, we provide an essential tool that enables a direct and free-of-artifacts determination of diffusion coefficients, which we expect to be pivotal for further studies on exciton dynamics in energy materials. American Chemical Society 2023-02-16 /pmc/articles/PMC9940293/ /pubmed/36794828 http://dx.doi.org/10.1021/acs.jpclett.2c03585 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Lo Gerfo M., Giulia
Bolzonello, Luca
Bernal-Texca, Francisco
Martorell, Jordi
van Hulst, Niek F.
Spatiotemporal Mapping Uncouples Exciton Diffusion from Singlet–Singlet Annihilation in the Electron Acceptor Y6
title Spatiotemporal Mapping Uncouples Exciton Diffusion from Singlet–Singlet Annihilation in the Electron Acceptor Y6
title_full Spatiotemporal Mapping Uncouples Exciton Diffusion from Singlet–Singlet Annihilation in the Electron Acceptor Y6
title_fullStr Spatiotemporal Mapping Uncouples Exciton Diffusion from Singlet–Singlet Annihilation in the Electron Acceptor Y6
title_full_unstemmed Spatiotemporal Mapping Uncouples Exciton Diffusion from Singlet–Singlet Annihilation in the Electron Acceptor Y6
title_short Spatiotemporal Mapping Uncouples Exciton Diffusion from Singlet–Singlet Annihilation in the Electron Acceptor Y6
title_sort spatiotemporal mapping uncouples exciton diffusion from singlet–singlet annihilation in the electron acceptor y6
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9940293/
https://www.ncbi.nlm.nih.gov/pubmed/36794828
http://dx.doi.org/10.1021/acs.jpclett.2c03585
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