To advance polymer solar cells (PSCs) toward real‐world applications, it is crucial to develop materials that are compatible with a low‐cost large‐scale manufacturing technology. In this context, a practically useful polymer should fulfill several critical requirements: the capability to provide high power conversion efficiencies (PCEs) via low‐cost fabrication using environmentally friendly solvents under mild thermal conditions, resulting in an active layer that is thick enough to minimize defects in large‐area films. Here, the development of new photovoltaic polymers is reported through rational molecular design to meet these requirements. Benzodithiophene (BDT)‐difluorobenzoxadiazole (ffBX)‐2‐decyltetradecyl (DT), a wide‐bandgap polymer based on ffBX and BDT emerges as the first example that fulfills the qualifications. When blended with a low‐cost acceptor (C₆₀‐fullerene derivative), BDT‐ffBX‐DT produces a PCE of 9.4% at active layer thickness over 250 nm. BDT‐ffBX‐DT devices can be fabricated from nonhalogenated solvents at low processing temperature. The success of BDT‐ffBX‐DT originates from its appropriate electronic structure and charge transport characteristics, in combination with a favorable face‐on orientation of the polymer backbone in blends, and the ability to form proper phase separation morphology with a fibrillar bicontinuous interpenetrating network in bulk‐heterojunction films. With these characteristics, BDT‐ffBX‐DT represents a meaningful step toward future everyday applications of polymer solar cells.

中文翻译：

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基于二氟苯并恶二唑的共轭聚合物在聚合物太阳能电池中的实际应用

为了将聚合物太阳能电池（PSC）推向现实应用，开发与低成本大规模生产技术兼容的材料至关重要。在这种情况下，实用的聚合物应满足几个关键要求：在温和的热条件下，通过使用环保溶剂通过低成本制造来提供高功率转换效率（PCE）的能力，从而形成足够厚的活性层，以最小化大面积胶片中的缺陷。在这里，通过合理的分子设计来报道满足这些要求的新型光伏聚合物的开发。苯并噻吩（BDT）-二氟苯并恶二唑（ffBX）-2-癸基十四烷基（DT）是一种基于ffBX和BDT的宽带隙聚合物，它是满足该条件的第一个示例。_60-富勒烯衍生物），BDT-ffBX-DT在250 nm的活性层厚度下产生9.4％的PCE。BDT-ffBX-DT设备可以在低处理温度下由非卤代溶剂制成。BDT-ffBX-DT的成功源于其适当的电子结构和电荷传输特性，以及共混物中聚合物主链的良好面朝取向，以及能够与纤维状双连续互穿网络形成适当的相分离形态的能力在体异质结薄膜中。凭借这些特性，BDT-ffBX-DT代表了未来聚合物太阳能电池日常应用的重要一步。