Efficient Non-fullerene Organic Solar Cells Enabled by Sequential Fluorination of Small-Molecule Electron Acceptors
Three small-molecule non-fullerene electron acceptors containing different numbers of fluorine atoms in their end groups were designed and synthesized. All three acceptors were found to exhibit relatively narrow band gaps with absorption profiles extending into the near-infrared region. The fluorina...
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doaj-f02504d2148d4950b2fef3fb8c6765132020-11-25T02:32:43ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462018-07-01610.3389/fchem.2018.00303396434Efficient Non-fullerene Organic Solar Cells Enabled by Sequential Fluorination of Small-Molecule Electron AcceptorsRuihao XieLei YingHailong LiaoZhongxin ChenFei HuangYong CaoThree small-molecule non-fullerene electron acceptors containing different numbers of fluorine atoms in their end groups were designed and synthesized. All three acceptors were found to exhibit relatively narrow band gaps with absorption profiles extending into the near-infrared region. The fluorinated analog exhibited enhanced light-harvesting capabilities, which led to improved short-circuit current densities. Moreover, fluorination improved the blend film morphology and led to desirable phase separation that facilitated exciton dissociation and charge transport. As a result of these advantages, organic solar cells based on the non-fullerene acceptors exhibited clearly improved short-circuit current densities and power conversion efficiencies compared with the device based on the non-fluorinated acceptor. These results suggest that fluorination can be an effective approach for the molecular design of non-fullerene acceptors with near-infrared absorption for organic solar cells.https://www.frontiersin.org/article/10.3389/fchem.2018.00303/fullorganic solar cellsnon-fullerenesmall molecule electron acceptorsfluorinationnear-infrared absorption |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ruihao Xie Lei Ying Hailong Liao Zhongxin Chen Fei Huang Yong Cao |
spellingShingle |
Ruihao Xie Lei Ying Hailong Liao Zhongxin Chen Fei Huang Yong Cao Efficient Non-fullerene Organic Solar Cells Enabled by Sequential Fluorination of Small-Molecule Electron Acceptors Frontiers in Chemistry organic solar cells non-fullerene small molecule electron acceptors fluorination near-infrared absorption |
author_facet |
Ruihao Xie Lei Ying Hailong Liao Zhongxin Chen Fei Huang Yong Cao |
author_sort |
Ruihao Xie |
title |
Efficient Non-fullerene Organic Solar Cells Enabled by Sequential Fluorination of Small-Molecule Electron Acceptors |
title_short |
Efficient Non-fullerene Organic Solar Cells Enabled by Sequential Fluorination of Small-Molecule Electron Acceptors |
title_full |
Efficient Non-fullerene Organic Solar Cells Enabled by Sequential Fluorination of Small-Molecule Electron Acceptors |
title_fullStr |
Efficient Non-fullerene Organic Solar Cells Enabled by Sequential Fluorination of Small-Molecule Electron Acceptors |
title_full_unstemmed |
Efficient Non-fullerene Organic Solar Cells Enabled by Sequential Fluorination of Small-Molecule Electron Acceptors |
title_sort |
efficient non-fullerene organic solar cells enabled by sequential fluorination of small-molecule electron acceptors |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Chemistry |
issn |
2296-2646 |
publishDate |
2018-07-01 |
description |
Three small-molecule non-fullerene electron acceptors containing different numbers of fluorine atoms in their end groups were designed and synthesized. All three acceptors were found to exhibit relatively narrow band gaps with absorption profiles extending into the near-infrared region. The fluorinated analog exhibited enhanced light-harvesting capabilities, which led to improved short-circuit current densities. Moreover, fluorination improved the blend film morphology and led to desirable phase separation that facilitated exciton dissociation and charge transport. As a result of these advantages, organic solar cells based on the non-fullerene acceptors exhibited clearly improved short-circuit current densities and power conversion efficiencies compared with the device based on the non-fluorinated acceptor. These results suggest that fluorination can be an effective approach for the molecular design of non-fullerene acceptors with near-infrared absorption for organic solar cells. |
topic |
organic solar cells non-fullerene small molecule electron acceptors fluorination near-infrared absorption |
url |
https://www.frontiersin.org/article/10.3389/fchem.2018.00303/full |
work_keys_str_mv |
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