Polymer Donor with a Simple Skeleton and Minor Siloxane Decoration Enables 19% Efficiency of Organic Solar Cells,Advanced Materials

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Polymer Donor with a Simple Skeleton and Minor Siloxane Decoration Enables 19% Efficiency of Organic Solar Cells
Advanced Materials ( IF 27.4 ) Pub Date : 2024-01-18 , DOI: 10.1002/adma.202313074
Xing Chen ₁ , Mingqing Chen ₁ , Jiahao Liang ₁ , Haizhen Liu ₁ , Xianglun Xie ₁ , Lianjie Zhang ₁ , Dongge Ma ₁ , Junwu Chen ₁

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Development of polymer donors with simple chemical structure and low cost is of great importance for commercial application of organic solar cells (OSCs). Here, side-chain random copolymer PMQ-Si605 with a simply 6,7-difluoro-3-methylquinoxaline-thiophene backbone and 5% siloxane decoration of side chain is synthesized in comparison with its alternating copolymer PTQ11. Relative to molecular weight (M_n) of 28.3 kg mol⁻¹ for PTQ11, the random copolymer PMQ-Si605 with minor siloxane decoration is beneficial for achieving higher M_n up to 51.1 kg mol⁻¹. In addition, PMQ-Si605 can show stronger aggregation ability and faster charge mobility as well as more efficient exciton dissociation in active layer as revealed by femtosecond transient absorption spectroscopy. With L8-BO-F as acceptor, its PMQ-Si605 based OSCs display power conversion efficiency (PCE) of 18.08%, much higher than 16.21% for PTQ11 based devices. With another acceptor BTP-H2 to optimize the photovoltaic performance of PMQ-Si605, further elevated PCEs of 18.50% and 19.15% can be achieved with the binary and ternary OSCs, respectively. Furthermore, PMQ-Si605 based active layers are suitable for processing in high humidity air, an important factor for massive production of OSCs. Therefore, the siloxane decoration on polymer donors is promising, affording PMQ-Si605 as a high-performing and low cost candidate.

中文翻译：

具有简单骨架和少量硅氧烷装饰的聚合物供体使有机太阳能电池的效率达到 19%

开发化学结构简单、成本低廉的聚合物给体对于有机太阳能电池（OSC）的商业应用具有重要意义。这里，合成了具有简单的6,7-二氟-3-甲基喹喔啉-噻吩主链和侧链5％硅氧烷装饰的侧链无规共聚物PMQ-Si605，与其交替共聚物PTQ11进行比较。相对于PTQ11的28.3 kg mol ^-1的分子量( M _n )，具有少量硅氧烷修饰的无规共聚物PMQ-Si605有利于实现高达51.1 kg mol ^-1的更高M _n 。此外，飞秒瞬态吸收光谱显示，PMQ-Si605可以表现出更强的聚集能力和更快的电荷迁移率以及活性层中更有效的激子解离。以 L8-BO-F 作为受体，其基于 PMQ-Si605 的 OSC 显示功率转换效率 (PCE) 为 18.08%，远高于基于 PTQ11 的器件的 16.21%。利用另一个受体 BTP-H2 来优化 PMQ-Si605 的光伏性能，二元和三元 OSC 的 PCE 分别可以进一步提高 18.50% 和 19.15%。此外，基于PMQ-Si605的有源层适合在高湿度空气中加工，这是大规模生产OSC的一个重要因素。因此，聚合物供体上的硅氧烷修饰是有前景的，使 PMQ-Si605 成为高性能和低成本的候选材料。

更新日期：2024-01-18

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