Anatomy of the energetic driving force for charge generation in organic solar cells

Eliminating the excess energetic driving force in organic solar cells leads to a smaller energy loss and higher device performance; hence, it is vital to understand the relation between the interfacial energetics and the photoelectric conversion efficiency. In this study, we systematically investiga...

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Autores principales: Nakano, Kyohei, Chen, Yujiao, Xiao, Bo, Han, Weining, Huang, Jianming, Yoshida, Hiroyuki, Zhou, Erjun, Tajima, Keisuke
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6555791/
https://www.ncbi.nlm.nih.gov/pubmed/31175294
http://dx.doi.org/10.1038/s41467-019-10434-3
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author Nakano, Kyohei
Chen, Yujiao
Xiao, Bo
Han, Weining
Huang, Jianming
Yoshida, Hiroyuki
Zhou, Erjun
Tajima, Keisuke
author_facet Nakano, Kyohei
Chen, Yujiao
Xiao, Bo
Han, Weining
Huang, Jianming
Yoshida, Hiroyuki
Zhou, Erjun
Tajima, Keisuke
author_sort Nakano, Kyohei
collection PubMed
description Eliminating the excess energetic driving force in organic solar cells leads to a smaller energy loss and higher device performance; hence, it is vital to understand the relation between the interfacial energetics and the photoelectric conversion efficiency. In this study, we systematically investigate 16 combinations of four donor polymers and four acceptors in planar heterojunction. The charge generation efficiency and its electric field dependence correlate with the energy difference between the singlet excited state and the interfacial charge transfer state. The threshold energy difference is 0.2 to 0.3 eV, below which the efficiency starts dropping and the charge generation becomes electric field-dependent. In contrast, the charge generation efficiency does not correlate with the energy difference between the charge transfer and the charge-separated states, indicating that the binding of the charge pairs in the charge transfer state is not the determining factor for the charge generation.
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spelling pubmed-65557912019-06-21 Anatomy of the energetic driving force for charge generation in organic solar cells Nakano, Kyohei Chen, Yujiao Xiao, Bo Han, Weining Huang, Jianming Yoshida, Hiroyuki Zhou, Erjun Tajima, Keisuke Nat Commun Article Eliminating the excess energetic driving force in organic solar cells leads to a smaller energy loss and higher device performance; hence, it is vital to understand the relation between the interfacial energetics and the photoelectric conversion efficiency. In this study, we systematically investigate 16 combinations of four donor polymers and four acceptors in planar heterojunction. The charge generation efficiency and its electric field dependence correlate with the energy difference between the singlet excited state and the interfacial charge transfer state. The threshold energy difference is 0.2 to 0.3 eV, below which the efficiency starts dropping and the charge generation becomes electric field-dependent. In contrast, the charge generation efficiency does not correlate with the energy difference between the charge transfer and the charge-separated states, indicating that the binding of the charge pairs in the charge transfer state is not the determining factor for the charge generation. Nature Publishing Group UK 2019-06-07 /pmc/articles/PMC6555791/ /pubmed/31175294 http://dx.doi.org/10.1038/s41467-019-10434-3 Text en © The Author(s) 2019 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
Nakano, Kyohei
Chen, Yujiao
Xiao, Bo
Han, Weining
Huang, Jianming
Yoshida, Hiroyuki
Zhou, Erjun
Tajima, Keisuke
Anatomy of the energetic driving force for charge generation in organic solar cells
title Anatomy of the energetic driving force for charge generation in organic solar cells
title_full Anatomy of the energetic driving force for charge generation in organic solar cells
title_fullStr Anatomy of the energetic driving force for charge generation in organic solar cells
title_full_unstemmed Anatomy of the energetic driving force for charge generation in organic solar cells
title_short Anatomy of the energetic driving force for charge generation in organic solar cells
title_sort anatomy of the energetic driving force for charge generation in organic solar cells
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6555791/
https://www.ncbi.nlm.nih.gov/pubmed/31175294
http://dx.doi.org/10.1038/s41467-019-10434-3
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