南开大学陈永胜研究团队报道，含过卤代噻吩基固体添加剂的二元全聚合物太阳能电池效率超过18%。相关研究成果于2024年1月3日发表在《德国应用化学》。

所有聚合物共混物的形态控制在制造高性能有机太阳能电池方面是典型但具有挑战性的。最近，固体添加剂（SAs）已被认可能够调节聚合物的形态：小分子共混物，提高器件的性能和稳定性。

该文采用3，4-二溴-2,5-二碘噻吩（SA-T1）、2，5-二溴-3,4-二碘噻苯（SA-T2）和2，3-二溴-4,5-二氯噻吩（SA-T3）三种全卤噻吩作为SAs来优化所有聚合物有机太阳能电池（APSCs）的性能。对于PM6和PY-IT的共混物，得益于全卤噻吩和聚合物之间的分子间相互作用，引入这些SAs后可以精细地调节分子填充性能。原位UV-Vis测量表明，这些SAs可以帮助全聚合物共混物的形态特征演变，从而获得最佳形态。与PM6:PY-IT的铸态器件相比，所有SAs处理的二元器件都具有17.4–18.3%的功率转换效率提高，短路电流密度和填充因子明显提高。

据研究人员所知，SA-T1处理的二进制APSCs的PCE为18.3%，是迄今为止所有二进制APSCs中最高的。同时，证明了SA-T1在其他全聚合物共混物中的普遍性，器件性能均得到提高。

该项工作为实现高性能APSCs提供了一条新的途径。

附：英文原文

Title: Binary All-polymer Solar Cells with a Perhalogenated-Thiophene-Based Solid Additive Surpass 18% Efficiency

Author: Wanying Feng, Tianqi Chen, Yulu Li, Tainan Duan, Xue Jiang, Cheng Zhong, Yunxin Zhang, Jifa Yu, Guanghao Lu, Xiangjian Wan, Bin Kan, Yongsheng Chen

Issue&Volume: 2024-01-03

Abstract: Morphological control of all-polymer blends is quintessential yet challenging in fabricating high-performance organic solar cells. Recently, solid additives (SAs) have been approved to be capable in tuning the morphology of polymer: small-molecule blends improving the performance and stability of devices. Herein, three perhalogenated thiophenes, which are 3,4-dibromo-2,5-diiodothiophene (SA-T1), 2,5-dibromo-3,4-diiodothiophene (SA-T2), and 2,3-dibromo-4,5-diiodothiophene (SA-T3), were adopted as SAs to optimize the performance of all-polymer organic solar cells (APSCs). For the blend of PM6 and PY-IT, benefitting from the intermolecular interactions between perhalogenated thiophenes and polymers, the molecular packing properties could be finely regulated after introducing these SAs. In-situ UV-Vis measurement revealed that these SAs could assist morphological character evolution in the all-polymer blend, leading to their optimal morphologies. Compared to the as-cast device of PM6:PY-IT, all SA-treated binary devices displayed enhanced power conversion efficiencies of 17.4 – 18.3% with obviously elevated short-circuit current densities and fill factors. To our knowledge, the PCE of 18.3% for SA-T1-treated binary ranks the highest among all binary APSCs to date. Meanwhile, the universality of SA-T1 in other all-polymer blends is demonstrated with unanimously improved device performance. This work provide a new pathway in realizing high-performance APSCs.

DOI: 10.1002/anie.202316698

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202316698