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Resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals

Multi-photon absorption and multiple exciton generation represent two separate strategies for enhancing the conversion efficiency of light into usable electric power. Targeting below-band-gap and above-band-gap energies, respectively, to date these processes have only been demonstrated independently...

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Autores principales: Manzi, Aurora, Tong, Yu, Feucht, Julius, Yao, En-Ping, Polavarapu, Lakshminarayana, Urban, Alexander S., Feldmann, Jochen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5904181/
https://www.ncbi.nlm.nih.gov/pubmed/29666394
http://dx.doi.org/10.1038/s41467-018-03965-8
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author Manzi, Aurora
Tong, Yu
Feucht, Julius
Yao, En-Ping
Polavarapu, Lakshminarayana
Urban, Alexander S.
Feldmann, Jochen
author_facet Manzi, Aurora
Tong, Yu
Feucht, Julius
Yao, En-Ping
Polavarapu, Lakshminarayana
Urban, Alexander S.
Feldmann, Jochen
author_sort Manzi, Aurora
collection PubMed
description Multi-photon absorption and multiple exciton generation represent two separate strategies for enhancing the conversion efficiency of light into usable electric power. Targeting below-band-gap and above-band-gap energies, respectively, to date these processes have only been demonstrated independently. Here we report the combined interaction of both nonlinear processes in CsPbBr(3) perovskite nanocrystals. We demonstrate nonlinear absorption over a wide range of below-band-gap excitation energies (0.5–0.8 E(g)). Interestingly, we discover high-order absorption processes, deviating from the typical two-photon absorption, at specific energetic positions. These energies are associated with a strong enhancement of the photoluminescence intensity by up to 10(5). The analysis of the corresponding energy levels reveals that the observed phenomena can be ascribed to the resonant creation of multiple excitons via the absorption of multiple below-band-gap photons. This effect may open new pathways for the efficient conversion of optical energy, potentially also in other semiconducting materials.
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spelling pubmed-59041812018-04-20 Resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals Manzi, Aurora Tong, Yu Feucht, Julius Yao, En-Ping Polavarapu, Lakshminarayana Urban, Alexander S. Feldmann, Jochen Nat Commun Article Multi-photon absorption and multiple exciton generation represent two separate strategies for enhancing the conversion efficiency of light into usable electric power. Targeting below-band-gap and above-band-gap energies, respectively, to date these processes have only been demonstrated independently. Here we report the combined interaction of both nonlinear processes in CsPbBr(3) perovskite nanocrystals. We demonstrate nonlinear absorption over a wide range of below-band-gap excitation energies (0.5–0.8 E(g)). Interestingly, we discover high-order absorption processes, deviating from the typical two-photon absorption, at specific energetic positions. These energies are associated with a strong enhancement of the photoluminescence intensity by up to 10(5). The analysis of the corresponding energy levels reveals that the observed phenomena can be ascribed to the resonant creation of multiple excitons via the absorption of multiple below-band-gap photons. This effect may open new pathways for the efficient conversion of optical energy, potentially also in other semiconducting materials. Nature Publishing Group UK 2018-04-17 /pmc/articles/PMC5904181/ /pubmed/29666394 http://dx.doi.org/10.1038/s41467-018-03965-8 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Manzi, Aurora
Tong, Yu
Feucht, Julius
Yao, En-Ping
Polavarapu, Lakshminarayana
Urban, Alexander S.
Feldmann, Jochen
Resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals
title Resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals
title_full Resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals
title_fullStr Resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals
title_full_unstemmed Resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals
title_short Resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals
title_sort resonantly enhanced multiple exciton generation through below-band-gap multi-photon absorption in perovskite nanocrystals
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5904181/
https://www.ncbi.nlm.nih.gov/pubmed/29666394
http://dx.doi.org/10.1038/s41467-018-03965-8
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