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• W3197056031 abstract "Three narrow bandgap non-fullerene acceptors (NFAs) named as IDTT2OT, IDTT2OT-2F, and IDTT2OT-4F were designed and synthesized using a 3,4-dimethoxythiophene as a π–spacer linking the indacenodithieno[3,2-b]thiophene (IDTT) core and 2-(3-oxo-2,2,3-dihydroinden-1-ylidene) (IC) end groups. The NFAs exhibited relatively narrow bandgaps (1.51, 1.45, and 1.42 eV) and up-shifted unoccupied molecular orbital (LUMO) energy levels (–3.69, –3.83, and −3.90 eV) owing to the 3,4-dimethoxythiophene effect compared with the similar structures. By finely tuning the energy levels modulation with a poly[2,6-4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo-1,2-b:4,5-b']dithiophene])-alt-(5,5-(1,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′-c:4′,5′-c']dithiophene-4,8-dione)) (PBDB-T) donor, all the NFA-based devices showed the broad photo-responses, at 300–900 nm, with small energy losses of 0.56–0.58 eV, and thus enhanced the light-harvesting ability of organic solar cells (OSCs). Among the NFA-based blends, the PBDB-T:IDTT2OT-4F device exhibited the best power conversion efficiency (PCE, 10.40%) with a high short-circuit current density (JSC) of 19.3 mA cm–2 and an open-circuit voltage (VOC) of 0.86 V. Our results demonstrate that introducing 3,4-dimethoxythiophene is an efficient strategy for improving the electron accepting ability of NFAs by tuning frontier energy levels." @default.
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• W3197056031 date "2021-10-01" @default.
• W3197056031 modified "2023-09-24" @default.
• W3197056031 title "Synthesis of 3,4-dimethoxythiophene spacer-based non-fullerene acceptors for efficient organic solar cells" @default.
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• W3197056031 doi "https://doi.org/10.1016/j.synthmet.2021.116880" @default.
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