Over 14% Efficiency in Organic Solar Cells Enabled by Chlorinated Nonfullerene Small-Molecule Acceptors

doi:10.1002/adma.201800613

. 2018 Jul;30(28):e1800613.

doi: 10.1002/adma.201800613. Epub 2018 May 28.

Over 14% Efficiency in Organic Solar Cells Enabled by Chlorinated Nonfullerene Small-Molecule Acceptors

Hao Zhang^{1

2}, Huifeng Yao¹, Junxian Hou³, Jie Zhu¹, Jianqi Zhang⁴, Wanning Li^{1

2}, Runnan Yu^{1

2}, Bowei Gao^{1

2}, Shaoqing Zhang¹, Jianhui Hou^{1

2

3}

Affiliations

¹ State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
² School of Chemical Science, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Department of Composite Materials and Engineering College of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, P. R. China.
⁴ Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.

PMID: 29806223
DOI: 10.1002/adma.201800613

Over 14% Efficiency in Organic Solar Cells Enabled by Chlorinated Nonfullerene Small-Molecule Acceptors

Hao Zhang et al. Adv Mater. 2018 Jul.

. 2018 Jul;30(28):e1800613.

doi: 10.1002/adma.201800613. Epub 2018 May 28.

Authors

Hao Zhang^{1

2}, Huifeng Yao¹, Junxian Hou³, Jie Zhu¹, Jianqi Zhang⁴, Wanning Li^{1

2}, Runnan Yu^{1

2}, Bowei Gao^{1

2}, Shaoqing Zhang¹, Jianhui Hou^{1

2

3}

Affiliations

¹ State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
² School of Chemical Science, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Department of Composite Materials and Engineering College of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, P. R. China.
⁴ Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.

PMID: 29806223
DOI: 10.1002/adma.201800613

Abstract

To make organic solar cells (OSCs) more competitive in the diverse photovoltaic cell technologies, it is very important to demonstrate that OSCs can achieve very good efficiencies and that their cost can be reduced. Here, a pair of nonfullerene small-molecule acceptors, IT-2Cl and IT-4Cl, is designed and synthesized by introducing easy-synthesis chlorine substituents onto the indacenodithieno[3,2-b]thiophene units. The unique feature of the large dipole moment of the CCl bond enhances the intermolecular charge-transfer effect between the donor-acceptor structures, and thus expands the absorption and down shifts the molecular energy levels. Meanwhile, the introduction of CCl also causes more pronounced molecular stacking, which also helps to expand the absorption spectrum. Both of the designed OSCs devices based on two acceptors can deliver a power conversion efficiency (PCE) greater than 13% when blended with a polymer donor with a low-lying highest occupied molecular orbital level. In addition, since IT-2Cl and IT-4Cl have very good compatibility, a ternary OSC device integrating these two acceptors is also fabricated and obtains a PCE greater than 14%. Chlorination demonstrates effective ability in enhancing the device performance and facile synthesis route, which both deserve further exploitation in the modification of photovoltaic materials.

Keywords: chlorination; cost; nonfullerene acceptors; organic solar cells; ternary solar cells.

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Over 14% Efficiency in Organic Solar Cells Enabled by Chlorinated Nonfullerene Small-Molecule Acceptors

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Over 14% Efficiency in Organic Solar Cells Enabled by Chlorinated Nonfullerene Small-Molecule Acceptors

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