Asymmetric wide‐bandgap fullerene‐free acceptors (FFAs) play a crucial role in organic solar cells (OSCs). Here, we designed and synthesized a simple asymmetric coumarin‐anthracene conjugate named CA‐CN with optical bandgap of 2.1 eV in a single‐step condensation reaction. Single crystal X‐ray structure analysis confirms various multiple intermolecular non‐covalent interactions. The molecular orbital energy levels of CA‐CN estimated from cyclic voltammetry were found to be suitable for its use as an acceptor for OSCs. Binary OSCs fabricated using CA‐CN as acceptor and PTB7‐Th as the donor achieve a power conversion efficiency (PCE) of 11.13%. We further demonstrate that the insertion of 20 wt% of CA‐CN as a third component in ternary OSCs with PTB7‐Th:DICTF as the host material achieved an impressive PCE of 14.91%, an improvement of ~43% compared to the PTB7‐Th:DICTF binary device (10.38%). Importantly, the ternary blend enhances the absorption coverage from 400 to 800 nm and improves the morphology of the active layer. The findings highlight the efficacy of an asymmetric design approach for FFAs, which paves the way for developing high‐efficiency OSCs at low cost.

中文翻译：

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不对称香豆素-蒽缀合物作为有机太阳能电池的高效无富勒烯受体

不对称宽带隙无富勒烯受体（FFA）在有机太阳能电池（OSC）中发挥着至关重要的作用。在这里，我们在一步缩合反应中设计并合成了一种简单的不对称香豆素-蒽缀合物，名为 CA-CN，其光学带隙为 2.1 eV。单晶 X 射线结构分析证实了各种多重分子间非共价相互作用。通过循环伏安法估算的 CA-CN 分子轨道能级被发现适合用作 OSC 的受体。使用CA-CN作为受体和PTB7-Th作为供体制造的二元OSC实现了11.13%的功率转换效率（PCE）。我们进一步证明，在以 PTB7-Th:DICTF 作为主体材料的三元 OSC 中插入 20 wt% 的 CA-CN 作为第三组分，实现了 14.91% 的令人印象深刻的 PCE，与 PTB7-Th:DICTF 相比，提高了约 43%。 Th：DICTF 二进制设备（10.38%）。重要的是，三元混合物增强了 400 至 800 nm 的吸收覆盖范围，并改善了活性层的形态。研究结果强调了 FFA 不对称设计方法的有效性，这为以低成本开发高效 OSC 铺平了道路。