期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 15, 期 9, 页码 3854-3861出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ee00972b
关键词
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资金
- National Natural Science Foundation of China (NSFC) [51825301, 52003013, 21734001]
- program of Academic Excellence Foundation of BUAA for PhD Students
This study developed a series of polymer acceptors using a random copolymerization strategy, which demonstrated better optical and electronic properties compared to traditional polymer acceptors. The highest efficiency all-polymer solar cell to date was successfully fabricated.
The past few years have witnessed rapid progress of all-polymer solar cells (all-PSCs), however, the simultaneous achievement of high open-circuit voltage (V-oc), short-circuit current density (J(sc)) and fill factor (FF) still remains a critical challenge. Herein, we used a random copolymerization strategy to develop a series of polymer acceptors named PY-X (where X stands for the molar ratio of two monomers) by polymerizing small molecule acceptor (SMA) monomers of SMA-C11 and SMA-DT with 2,5-bis(trimethylstannyl)thiophene as the connecting unit. Upon random copolymerization, the optical and electronic properties of the polymer acceptors can be well tuned. Consequently, compared with PY-C11 and PY-DT, the random copolymer based all-PSCs exhibit improved PCEs. The best-performing device based on PY-82 produces a high PCE of 17.15% (certified as 16.7%), with a V-oc of 0.950 V, a J(sc) of 23.82 mA cm(-2), and an FF of 75.8%, representing the highest efficiency reported for the binary all-PSCs to date. This work suggests that random copolymerization is a promising synthetic strategy in developing efficient polymer acceptors.
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