A<sub>2</sub>-A<sub>1</sub>-D-A<sub>1</sub>-A<sub>2</sub>-Type Nonfullerene Acceptors.
review · Level V
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- Record sourced from PubMed, PMID 37907430.
- Also identified by DOI 10.1002/adma.202300175.
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Abstract
The A<sub>2</sub>-A<sub>1</sub>-D-A<sub>1</sub>-A<sub>2</sub>-type molecules consist of one electron-donating (D) core flanked by two electron-accepting units (A<sub>1</sub> and A<sub>2</sub>) and have emerged as an essential branch of nonfullerene acceptors (NFAs). These molecules generally possess higher molecular energy levels and wider optical bandgaps compared with those of the classic A-D-A- and A-DA'D-A-type NFAs, owing to the attenuated intramolecular charge transfer effect. These characteristics make them compelling choices for the fabrication of high-voltage organic photovoltaics (OPVs), ternary OPVs, and indoor OPVs. Herein, the recent progress in the A<sub>2</sub>-A<sub>1</sub>-D-A<sub>1</sub>-A<sub>2</sub>-type NFAs are reviewed, including the molecular engineering, structure-property relationships, voltage loss (V<sub>loss</sub>), device stability, and photovoltaic performance of binary, ternary, and indoor OPVs. Finally, the challenges and provided prospects are discussed for the further development of this type of NFAs.