Simple Non‐Fused Electron Acceptors Leading to Efficient Organic Photovoltaics

Despite the remarkable progress achieved in recent years, organic photovoltaics (OPVs) still need work to approach the delicate balance between efficiency, stability, and cost. Herein, two fully non‐fused electron acceptors, PTB4F and PTB4Cl, are developed via a two‐step synthesis from single aromat...

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Published inAngewandte Chemie International Edition Vol. 60; no. 23; pp. 12964 - 12970
Main Authors Wen, Tian‐Jiao, Liu, Zhi‐Xi, Chen, Zeng, Zhou, Jiadong, Shen, Ziqiu, Xiao, Yiqun, Lu, Xinhui, Xie, Zengqi, Zhu, Haiming, Li, Chang‐Zhi, Chen, Hongzheng
Format Journal Article
LanguageEnglish
Published WEINHEIM Wiley 01.06.2021
Wiley Subscription Services, Inc
EditionInternational ed. in English
Subjects
Charge transfer
Chemistry
Chemistry, Multidisciplinary
Electrons
Energy conversion
Energy conversion efficiency
Excitons
Heterojunctions
non-fused-ring acceptors
organic photovoltaics
Photovoltaic cells
Photovoltaics
Physical Sciences
Polymer blends
Polymers
Science & Technology
solar cells
POLYMER SOLAR-CELLS
energy conversion
solar cells
non-fused-ring acceptors
organic photovoltaics
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Summary:Despite the remarkable progress achieved in recent years, organic photovoltaics (OPVs) still need work to approach the delicate balance between efficiency, stability, and cost. Herein, two fully non‐fused electron acceptors, PTB4F and PTB4Cl, are developed via a two‐step synthesis from single aromatic units. The introduction of a two‐dimensional chain and halogenated terminals for these non‐fused acceptors plays a synergistic role in optimizing their solid stacking and orientation, thus promoting an elongated exciton lifetime and fast charge‐transfer rate in bulk heterojunction blends. As a result, PTB4Cl, upon blending with PBDB‐TF polymer, has enabled single‐junction OPVs with power conversion efficiencies of 12.76 %, representing the highest values among the reported fully unfused electron acceptors so far. Two new non‐fused‐ring acceptors (NFRAs), denoted as PTB4F and PTB4Cl, are developed via a two‐step synthesis from simple phenyl and thiophene units. The corresponding organic photovoltaics based on PTB4Cl:PBDB‐TF have impressively achieved a power conversion efficiency of 12.76 %, representing the highest value among the fully non‐fused NFRAs reported so far.
Bibliography:These authors contributed equally to this work.
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ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202101867