Batch-to-batch variation widely exists in conjugated donor-acceptor (D-A) block copolymer materials and plays a crucial role in photovoltaic performance of organic solar cells (OSCs). To investigate the influence of conjugated-length of the intermediate block on the performance of single-component OSC (SCOSCs), herein, four batches of conjugated block copolymers (CBCs, PB-b-PY-1, PB-b-PY-2, PB-b-PY-3, and PB-b-PY-4) are synthesized, which possess different D/A block lengths. As the conjugation length of intermediate D-block increases, the lamellar packing order of these CBCs shows a monotonically increasing trend, leading to stronger absorption spectra in the visible region, efficient charge transfer, and suppressed carrier recombination loss. Consequently, the PB-b-PY-4 device yields a higher efficiency of 13.28% than those of other CBCs. This study demonstrates the effectiveness of the conjugated length of intermediate D-blocks in designing high-performance conjugated D-A block copolymers, which paves the way toward developing high-performance SCOSCs.

中文翻译：

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通过调整中间 PBDB-T 嵌段的共轭长度实现效率超过 13% 的单组分有机太阳能电池

批次间差异广泛存在于共轭供体-受体 (DA) 嵌段共聚物材料中，并且在有机太阳能电池 (OSC) 的光伏性能中起着至关重要的作用。为了研究中间嵌段的共轭长度对单组分 OSC (SCOSCs) 性能的影响，本文中，四批共轭嵌段共聚物 (CBCs、PB- b -PY-1、PB- b -PY-2 , PB- b -PY-3, 和 PB- b-PY-4) 被合成，具有不同的 D/A 块长度。随着中间 D-block 共轭长度的增加，这些 CBC 的层状堆积顺序呈单调增加趋势，导致可见光区吸收光谱更强，电荷转移有效，载流子复合损失受到抑制。因此， PB- b -PY-4 器件的效率比其他 CBC 的效率高 13.28%。该研究证明了中间 D 嵌段的共轭长度在设计高性能共轭 DA 嵌段共聚物中的有效性，这为开发高性能 SCOSC 铺平了道路。