A 4‐Arm Small Molecule Acceptor with High Photovoltaic Performance

Manipulating the backbone of small molecule acceptors (SMAs) is of particular importance in developing efficient organic solar cells (OSCs). The common design is constructing 2‐arm SMAs with linear or curved backbones. Herein, we report an acceptor 4A‐DFIC with a 4‐arm backbone unexpectedly generate...

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Published in:Angewandte Chemie International Edition 2022-09, Vol.61 (38), p.e202207762-n/a
Main Authors: Meng, Xianyi, Li, Mingjie, Jin, Ke, Zhang, Lixiu, Sun, Jie, Zhang, Wenhua, Yi, Chenyi, Yang, Junliang, Hao, Feng, Wang, Guan‐Wu, Xiao, Zuo, Ding, Liming
Format: Article
Language:English
Subjects:
Acceptor
Diamines
Energy conversion efficiency
Multi-Arm
Organic Solar Cells
Photovoltaic cells
Photovoltaics
Small Molecule
Solar cells
Ternary
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Summary:Manipulating the backbone of small molecule acceptors (SMAs) is of particular importance in developing efficient organic solar cells (OSCs). The common design is constructing 2‐arm SMAs with linear or curved backbones. Herein, we report an acceptor 4A‐DFIC with a 4‐arm backbone unexpectedly generated in the reaction of an electron‐rich aromatic diamine and hexaketocyclohexane. Single‐crystal X‐ray diffraction analysis indicates the rigid and twisted molecular plane and the effective molecular stacking of 4A‐DFIC in solid state. 4A‐DFIC shows a low band gap of 1.40 eV and excellent light‐harvesting capability from visible to near‐infrared region. Binary and ternary OSCs based on 4A‐DFIC gave power conversion efficiencies (PCEs) of 15.76 % and 18.60 % (certified 18.1 %), respectively, which are the highest PCEs for multi‐arm SMA‐based OSCs to date. A 4‐arm small molecule acceptor (SMA) 4A‐DFIC was serendipitously made. Power conversion efficiencies of 15.76 % and 18.60 % were achieved in 4A‐DFIC‐based binary and ternary organic solar cells, respectively, setting new records for multi‐arm SMA‐based solar cells.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202207762