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Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors
The concept of bromination for organic solar cells has received little attention. However, the electron withdrawing ability and noncovalent interactions of bromine are similar to those of fluorine and chlorine atoms. A tetra‐brominated non‐fullerene acceptor, designated as BTIC‐4Br, has been recentl...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7201261/ https://www.ncbi.nlm.nih.gov/pubmed/32382488 http://dx.doi.org/10.1002/advs.201903784 |
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author | Wang, Huan Liu, Tao Zhou, Jiadong Mo, Daize Han, Liang Lai, Hanjian Chen, Hui Zheng, Nan Zhu, Yulin Xie, Zengqi He, Feng |
author_facet | Wang, Huan Liu, Tao Zhou, Jiadong Mo, Daize Han, Liang Lai, Hanjian Chen, Hui Zheng, Nan Zhu, Yulin Xie, Zengqi He, Feng |
author_sort | Wang, Huan |
collection | PubMed |
description | The concept of bromination for organic solar cells has received little attention. However, the electron withdrawing ability and noncovalent interactions of bromine are similar to those of fluorine and chlorine atoms. A tetra‐brominated non‐fullerene acceptor, designated as BTIC‐4Br, has been recently developed by introducing bromine atoms onto the end‐capping group of 2‐(3‐oxo‐2,3‐dihydro‐1H‐inden‐1‐ylidene) malononitrile and displayed a high power conversion efficiency (PCE) of 12%. To further improve its photovoltaic performance, the acceptor is optimized either by introducing a longer alkyl chain to the core or by modulating the numbers of bromine substituents. After changing each end‐group to a single bromine, the BTIC‐2Br‐m‐based devices exhibit an outstanding PCE of 16.11% with an elevated open‐circuit voltage of V (oc) = 0.88 V, one of the highest PCEs reported among brominated non‐fullerene acceptors. This significant improvement can be attributed to the higher light harvesting efficiency, optimized morphology, and higher exciton quenching efficiencies of the di‐brominated acceptor. These results demonstrate that the substitution of bromine onto the terminal group of non‐fullerene acceptors results in high‐efficiency organic semiconductors, and promotes the use of the halogen‐substituted strategy for polymer solar cell applications. |
format | Online Article Text |
id | pubmed-7201261 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-72012612020-05-07 Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors Wang, Huan Liu, Tao Zhou, Jiadong Mo, Daize Han, Liang Lai, Hanjian Chen, Hui Zheng, Nan Zhu, Yulin Xie, Zengqi He, Feng Adv Sci (Weinh) Communications The concept of bromination for organic solar cells has received little attention. However, the electron withdrawing ability and noncovalent interactions of bromine are similar to those of fluorine and chlorine atoms. A tetra‐brominated non‐fullerene acceptor, designated as BTIC‐4Br, has been recently developed by introducing bromine atoms onto the end‐capping group of 2‐(3‐oxo‐2,3‐dihydro‐1H‐inden‐1‐ylidene) malononitrile and displayed a high power conversion efficiency (PCE) of 12%. To further improve its photovoltaic performance, the acceptor is optimized either by introducing a longer alkyl chain to the core or by modulating the numbers of bromine substituents. After changing each end‐group to a single bromine, the BTIC‐2Br‐m‐based devices exhibit an outstanding PCE of 16.11% with an elevated open‐circuit voltage of V (oc) = 0.88 V, one of the highest PCEs reported among brominated non‐fullerene acceptors. This significant improvement can be attributed to the higher light harvesting efficiency, optimized morphology, and higher exciton quenching efficiencies of the di‐brominated acceptor. These results demonstrate that the substitution of bromine onto the terminal group of non‐fullerene acceptors results in high‐efficiency organic semiconductors, and promotes the use of the halogen‐substituted strategy for polymer solar cell applications. John Wiley and Sons Inc. 2020-02-28 /pmc/articles/PMC7201261/ /pubmed/32382488 http://dx.doi.org/10.1002/advs.201903784 Text en © 2020 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Communications Wang, Huan Liu, Tao Zhou, Jiadong Mo, Daize Han, Liang Lai, Hanjian Chen, Hui Zheng, Nan Zhu, Yulin Xie, Zengqi He, Feng Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors |
title | Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors |
title_full | Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors |
title_fullStr | Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors |
title_full_unstemmed | Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors |
title_short | Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors |
title_sort | bromination: an alternative strategy for non‐fullerene small molecule acceptors |
topic | Communications |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7201261/ https://www.ncbi.nlm.nih.gov/pubmed/32382488 http://dx.doi.org/10.1002/advs.201903784 |
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