Benzothiadiazole-Based Double-Cable Conjugated Polymers for Single-Component Organic Solar Cells with Efficiency over 4%,ACS Applied Polymer Materials

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Benzothiadiazole-Based Double-Cable Conjugated Polymers for Single-Component Organic Solar Cells with Efficiency over 4%
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-08-30 , DOI: 10.1021/acsapm.1c00743
Chao Wang _{1,

2} , Dongdong Xia ₂ , Fan Yang ₃ , Junyu Li ₄ , Yonggang Wu ₁ , Weiwei Li ₂

Affiliation

Double-cable conjugated polymers have been successfully applied into single-component organic solar cells (SCOSCs) in recent years. The chemical structures of conjugated backbones and aromatic cable units, and the rational tuning of nanophase separation between them, are clue factors for double-cable polymers to further enhance the photovoltaic performance. In this work, we introduced a benzothiadiazole (BT) unit into the backbone of double-cable polymers, where BT was conjugated with two linkers, thiophene and thienothiophene, which were used to control the aggregation behavior. The studies reveal that, although thiophene-containing polymer backbones show less aggregation tendency, the corresponding perylene bisimide (PBI) side units form better stacking. Therefore, thiophene-based double-cable polymers had high hole/electron mobilities and hence a high efficiency of 4.35%, while thienothiophene-containing polymer exhibited a low efficiency of 2.35%. These results demonstrate that BT-polymers display a promising application for high performance double-cable conjugated polymers for SCOSCs.

中文翻译：

用于单组分有机太阳能电池的苯并噻二唑基双线共轭聚合物，效率超过 4%

近年来，双电缆共轭聚合物已成功应用于单组分有机太阳能电池（SCOSCs）中。共轭骨架和芳香电缆单元的化学结构，以及它们之间纳米相分离的合理调整，是双电缆聚合物进一步提高光伏性能的线索因素。在这项工作中，我们将苯并噻二唑 (BT) 单元引入双电缆聚合物的主链中，其中 BT 与两个连接器（噻吩和噻吩并噻吩）缀合，用于控制聚集行为。研究表明，虽然含噻吩的聚合物主链显示较少的聚集趋势，但相应的苝双酰亚胺 (PBI) 侧单元形成更好的堆叠。所以，噻吩基双缆聚合物具有高空穴/电子迁移率，因此效率高达 4.35%，而含噻吩并噻吩的聚合物效率低，仅为 2.35%。这些结果表明，BT 聚合物显示出用于 SCOSC 的高性能双电缆共轭聚合物的有前途的应用。

更新日期：2021-09-10

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