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Near-Infrared Electron Acceptors with Unfused Architecture for Efficient Organic Solar Cells
摘要： Nonfullerene acceptor (NFA) with near-infrared (NIR) region absorption is crucial for obtaining high current densities in organic solar cells (OSCs). Herein, two narrow bandgap NFAs with unfused backbones possessing broad (600-900 nm) and strong absorption are developed by the conjugation of a benzothiadiazole (BT) core to halogenated end-groups through cyclopentadithiophene (CPDT) bridge. Compared with the fluorinated counterpart BCDT-4F, the chlorinated NFA BCDT-4Cl appears stronger J-aggregation and closer molecular packing, leading to the optimized blend morphology when paired with polymer donor, PBDB-T. Thus, an obvious improvement of external quantum efficiency response was obtained for BCDT-4Cl based OSCs, presenting a higher efficiency of 12.10% than that (9.65%) based on BCDT-4F. This work provides a design strategy for NIR acceptors in the combination of electron deficient core and halogenated terminal in unfused backbone, which results in not only fine-tuning of optoelectronic properties, but also the simplified synthetic complexities of molecule.
关键词： electron-deficient core,organic solar cell,halogenated end-group,unfused architecture,near-infrared electron acceptor
更新于2025-09-23 15:19:57
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Efficient organic solar cells based on a new a??Y-seriesa?? non-fullerene acceptor with an asymmetric electron-deficient-core
摘要： Herein, a new “Y-series” non-fullerene acceptor, Y21, bearing an asymmetric electron-deficient-core (DA’D) and fluorinated dicyanomethylene derivatives as flanking groups, was designed and synthesized for organic solar cell applications. Rather than being perfectly C2 symmetric manner of the traditional “Y-series” acceptor, Y21 possesses an electron-withdrawing unit (A’) shifted from the center of DA’D, turning into an asymmetric molecular geometry. Photovoltaic devices based on PM6:Y21 can realize a high Jsc of 24.9 mA cm-2, and a PCE of 15.4 %. Our work demonstrates a new way to tune the photoelectronic property of the “Y-series” NFAs.
关键词： non-fullerene acceptor,Y-series,asymmetric electron-deficient-core,organic solar cells,photovoltaic performance
更新于2025-09-19 17:13:59