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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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-06, Vol.60 (23), p.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: Article
Language:English
Subjects:
Charge transfer
Electrons
energy conversion
Energy conversion efficiency
Excitons
Heterojunctions
non-fused-ring acceptors
organic photovoltaics
Photovoltaic cells
Photovoltaics
Polymer blends
Polymers
solar cells
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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.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202101867