Wu Jingnan, Li Guangwei, Fang Jin, Guo Xia, Zhu Lei, Guo Bing, Wang Yulong, Zhang Guangye, Arunagiri Lingeswaran, Liu Feng, Yan He, Zhang Maojie, Li Yongfang
Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123, Suzhou, China.
Department of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, 200240, Shanghai, China.
Nat Commun. 2020 Sep 14;11(1):4612. doi: 10.1038/s41467-020-18378-9.
Developing a high-performance donor polymer is critical for achieving efficient non-fullerene organic solar cells (OSCs). Currently, most high-efficiency OSCs are based on a donor polymer named PM6, unfortunately, whose performance is highly sensitive to its molecular weight and thus has significant batch-to-batch variations. Here we report a donor polymer (named PM1) based on a random ternary polymerization strategy that enables highly efficient non-fullerene OSCs with efficiencies reaching 17.6%. Importantly, the PM1 polymer exhibits excellent batch-to-batch reproducibility. By including 20% of a weak electron-withdrawing thiophene-thiazolothiazole (TTz) into the PM6 polymer backbone, the resulting polymer (PM1) can maintain the positive effects (such as downshifted energy level and reduced miscibility) while minimize the negative ones (including reduced temperature-dependent aggregation property). With higher performance and greater synthesis reproducibility, the PM1 polymer has the promise to become the work-horse material for the non-fullerene OSC community.
开发一种高性能的供体聚合物对于实现高效非富勒烯有机太阳能电池（OSC）至关重要。目前，大多数高效OSC都基于一种名为PM6的供体聚合物，不幸的是，其性能对分子量高度敏感，因此批次间存在显著差异。在此，我们报道了一种基于无规三元聚合策略的供体聚合物（名为PM1），该策略可实现效率高达17.6%的高效非富勒烯OSC。重要的是，PM1聚合物表现出优异的批次间重现性。通过在PM6聚合物主链中引入20%的弱吸电子噻吩并噻唑并噻唑（TTz），所得聚合物（PM1）可以保持积极效果（如能级下移和混溶性降低），同时将消极效果（包括温度依赖性聚集性能降低）降至最低。凭借更高的性能和更大的合成重现性，PM1聚合物有望成为非富勒烯OSC领域中常用的材料。
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