利用 4-双(2-噻吩基)吡咯-2,5-二酮基聚合物添加剂诱导垂直偏析形态实现 19.10% 效率和 80.5% 填充因子的逐层有机太阳能电池,Advanced Materials

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利用 4-双(2-噻吩基)吡咯-2,5-二酮基聚合物添加剂诱导垂直偏析形态实现 19.10% 效率和 80.5% 填充因子的逐层有机太阳能电池
Advanced Materials ( IF 27.4 ) Pub Date : 2022-11-21 , DOI: 10.1002/adma.202208279
Mingwei Zhou ₁ , Chentong Liao ₁ , Yuwei Duan ₂ , Xiaopeng Xu ₁ , Liyang Yu ₁ , Ruipeng Li ₃ , Qiang Peng ₁

Affiliation

形态在决定电荷产生和收集过程中起着关键作用，从而影响有机太阳能电池（OSC）的性能。用于优化 OSC 形态的添加剂选择有限，特别是对于新兴的层状（LbL）OSC，阻碍了光伏性能的提高。本文报道了一种使用共轭聚合物作为添加剂来优化形貌以提高 LbL-OSC 光伏性能的新方法。开发了四种具有不同侧链的聚合物：PH 、 PS 、 PF和PCl 。由于不合适的能级排列和不利的分子相互作用，这些聚合物作为 BHJ 器件中的供体材料和添加剂表现出较差的性能。相比之下，它们可以作为有效的添加剂来优化 PM6 原纤维基质，以促进 BTP-eC9 的渗透并形成具有垂直隔离的交织的 D/A 双连续网络。这种形态通过侧链工程进行优化，从而逐步改进电荷分离和收集。因此，添加少量的 P  Cl 作为添加剂，优化的形貌有助于获得 19.10% 的冠军 PCE 和 80.5% 的高 FF。

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19.10% Efficiency and 80.5% Fill Factor Layer-by-Layer Organic Solar Cells Realized by 4-Bis(2-Thienyl)Pyrrole-2,5-Dione Based Polymer Additives for Inducing Vertical Segregation Morphology

The morphology plays a key role in determining the charge generation and collection process, thus impacting the performances of organic solar cells (OSCs). The limited selection pool of additives to optimize the morphology of OSCs, especially for the emerging layer-by-layer (LbL) OSCs, impeding the improvements of photovoltaic performances. Herein, a new method of using conjugated polymers as the additives to optimize the morphology for improving the photovoltaic performances of LbL-OSCs is reported. Four polymers of PH, PS, PF, and PCl are developed with different side chains. These polymers exhibit poor performances as donor materials and additives in the BHJ devices, due to the unsuitable energy level alignment and unfavorable molecular interactions. By contrast, they can be served as efficient additives to optimize the PM6 fibril matrix for facilitating the penetration of BTP-eC9 and forming an intertwined D/A bicontinuous network with a vertical segregation. Such morphology is optimized by side chain engineering, which enables the progressive improvement of the charge separation and collection. As a result, adding a small amount of PCl as the additive, the optimized morphology contributes to a champion PCE of 19.10% with a high FF of 80.5%.

更新日期：2022-11-21

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