Main chain donor and side chain acceptor (D‐s‐A) copolymers are an important branch of the D–A copolymer family. However, the development of D‐s‐A copolymers significantly falls behind the alternative D–A copolymers, especially for organic solar cells, because a breakthrough in device performance is not yet obtained with a reported power conversion efficiency (PCE) of 2%–4%. Herein, a newly developed D‐s‐A copolymer PDRCNBDT, bearing 2‐(1, 1‐dicyanomethylene) rhodanine pendant group as the donor material, delivers a high PCE of 5.3% for nonfullerene solar cells. To the best of our knowledge, this is the best value reported for D‐s‐A copolymers to date. The improved PCE is observed to be associated with a very small energy loss (E_loss) of 0.57 eV, accompanied by a high open‐circuit voltage (V_oc) of 1.015 eV. It is important to note that this efficient D‐s‐A copolymer is employed in organic solar cells (OSCs), free of additive and annealing treatments.

中文翻译：

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免处理后的主链供体和侧链受体（D-A）共聚物，用于低损耗的高效非富勒烯太阳能电池

主链供体和侧链受体（D-小号-A）共聚物是d-A共聚物家族的一个重要分支。但是，D- s -A共聚物的发展大大落后于其他D-A共聚物，特别是对于有机太阳能电池而言，因为据报道的2％的功率转换效率（PCE）尚未获得器件性能的突破， 4％。本文中，一种新开发的D- s- A共聚物PDRCNBDT，带有2-（1,1-二氰基亚甲基）若丹明侧基作为供体材料，可为非富勒烯太阳能电池提供5.3％的高PCE。据我们所知，这是D‐ s所报告的最高价值迄今为止的共聚物。观察到改进的PCE与0.57 eV的很小的能量损耗（E _loss）相关，并伴随有1.015 eV的高开路电压（V _oc）。重要的是要注意，这种高效的D- s- A共聚物用于有机太阳能电池（OSC），无需进行添加剂和退火处理。