Polymerized small-molecule acceptors (PSMAs) have made significant progress as the application in all-polymer solar cells (all-PSCs). Most PSMAs are constructed by near-infrared fused-ring electron acceptors via Stille polymerization, such as Y-series acceptors. However, very limited non-fused electron acceptors with simplified synthetic complexity have been used in PSMAs. In this work, two non-fused PSMAs with a benzothiadiazole (BT) core are developed for application in all-PSCs. The S–O non-covalent interaction and the regioregularity have been introduced to improve the crystallinity and charge transport properties. As a result, a high-power conversion efficiency (PCE) of 11.42% with an enhanced photocurrent has been obtained in these regioregular PBTO-γ-based solar cells, representing the highest PCEs based on non-fused PSMAs. The encouraging results will intrigue more design of non-fused PSMAs toward high-performance all-PSCs.

中文翻译：

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用于全聚合物太阳能电池的具有苯并噻二唑核的非融合聚合小分子受体

聚合小分子受体（PSMA）在全聚合物太阳能电池（all-PSC）中的应用取得了重大进展。大多数 PSMA 是由近红外稠环电子受体通过 Stille 聚合构建的，例如 Y 系列受体。然而，具有简化合成复杂性的非常有限的非稠合电子受体已用于 PSMA。在这项工作中，开发了两种具有苯并噻二唑 (BT) 核的非融合 PSMA，用于全 PSC。引入了 S-O 非共价相互作用和区域规整性以改善结晶度和电荷传输性能。因此，在这些基于区域规整 PBTO-γ 的太阳能电池中获得了 11.42% 的高功率转换效率 (PCE) 和增强的光电流，代表了基于非融合 PSMA 的最高 PCE。