Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 1, Pages 1603-1611Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c19632
Keywords
hybrid nonfused acceptor; fullerene pendant; exciton dissociation; charge collection; organic solar cells
Funding
- National Natural Science Foundation of China [51933001, 22075069, U1704137, 21734009]
- Natural Science Foundation of Henan Province [212300410002]
- Henan Province [19zx014]
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The rapid development of fused-ring electron acceptors has made them a potential substitute to fullerene-based acceptors in organic solar cells, while nonfused-ring acceptors can significantly reduce synthetic cost and achieve reasonable power conversion efficiencies.
The rapid advance of fused-ring electron acceptors (FREAs) has made them a potential substitute to fullerene-based acceptors and offered new avenues for the construction of organic solar cells (OSCs). Nonfused-ring acceptors (NFRAs) could significantly reduce the synthetic cost while achieving reasonable power conversion efficiencies (PCEs). Widely used fullerene acceptors have been applied as a second acceptor to regulate the morphology, absorption, and electron transport. To take full advantage of both nonfullerene and fullerene acceptors at the same time, we rationally designed and synthesized two novel NFRAs with phenyl-C-61-butyric acid methyl ester (PCBM) as the lateral pendent. With the incorporation of fullerene pendent in PCBM-C6 and PCBM-C10, varied UV-vis absorption and photoluminescence (PL) quenching behaviors were observed, and isotropic diffraction patterns were obtained via grazing incidence wide-angle X-ray scattering (GIWAXS) measurements. The bulky, spherical, and electronic isotropic fullerene pendent could effectively suppress severe molecular aggregation and form the preferred blend morphology. This strategy significantly improved the efficiencies for exciton separation and charge collection relative to the control acceptor CH3COO-C6. Finally, the V-oc, L-sc, and fill factor (FF) of PCBM-C10-based devices were simultaneously improved and an enhanced PCE of 13.55% was accomplished.
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