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Small-Molecule Acceptor Based on the Heptacyclic Benzodi(cyclopentadithiophene) Unit for Highly Efficient Nonfullerene Organic Solar Cells
Abstract
A new nonfullerene small molecule with acceptor–donor–acceptor (A–D–A) structure, namely, NFBDT, based on a heptacyclic benzodi(cyclopentadithiophene) (FBDT) unit using benzo[1,2- b:4,5- b ′]dithiophene as the core unit, was designed and synthesized. Its absorption ability, energy levels, thermal stability, as well as photovoltaic performances were fully investigated. NFBDT exhibits a low optical bandgap of 1.56 eV resulting in wide and efficient absorption that covered the range from 600 to 800 nm, and suitable energy levels as an electron acceptor. With the widely used and successful wide bandgap polymer PBDB-T selected as the electron donor material, an optimized PCE of 10.42% was obtained for the PBDB-T:NFBDT-based device with an outstanding short-circuit current density of 17.85 mA cm –2 under AM 1.5G irradiation (100 mW cm –2 ), which is so far among the highest performance of NF-OSC devices. These results demonstrate that the BDT unit could also be applied for designing NF-acceptors, and the fused-ring benzodi(cyclopentadithiophene) unit is a prospective block for designing new NF-acceptors with excellent performance.
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Metadata
- Authors
- Kan, B., Feng, H., Wan, X., Liu, F., Ke, X., Wang, Y., Wang, Y., Zhang, H., Li, C., Hou, J., & Chen, Y.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-03-24
- Volume
- 139
- Issue
- 13
- Pages
- 4929-4934
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2596727267
- Cited by
- 474
- References
- 48
- FWCI
- 38.37
- Type
- journal article
- Language
- en
- Open access
- closed
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