Intrinsically stretchable organic solar cells (IS-OSCs) have attracted great attention as a promising power source for wearable electronics. However, reconciling high power conversion efficiency (PCE), reasonable stretchability, and thermal stability is a grand challenge. Herein, we have successfully improved the ductility and morphological stability of the PM6:BTP-eC9 blend film through introducing polymer PY-IT to form entangled structure morphology. Compared with the binary blend, the ternary system exhibits suppressed diffusion and crystallization of BTP-eC9 acceptor and load distribution across the entangled chain networks to dissipate the local energy. As a result, high efficiencies of 16.52% were obtained for the flexible OSCs based on polyethylene terephthalate (PET) substrate. Impressively, the PCE of IS-OSCs based on the elastomer substrate also achieved 15.3%. In this work, the study about intrinsic stretchability and morphological robustness demonstrates that high-performance IS-OSCs constitute a major step toward practical utilization in malleable electronic textiles.

本质上可拉伸的有机太阳能电池（IS-OSCs）作为可穿戴电子产品的有前途的电源引起了极大的关注。然而，兼顾高功率转换效率（PCE）、合理的拉伸性和热稳定性是一个巨大的挑战。在此，我们通过引入聚合物 PY-IT 形成纠缠结构形态，成功地提高了 PM6:BTP-eC9 共混膜的延展性和形态稳定性。与二元共混物相比，三元体系表现出抑制 BTP-eC9 受体的扩散和结晶以及跨缠结链网络的负载分布以消散局部能量。结果，基于聚对苯二甲酸乙二醇酯 (PET) 基板的柔性 OSC 获得了 16.52% 的高效率。令人印象深刻的是，基于弹性体基材的 IS-OSC 的 PCE 也达到了 15.3%。在这项工作中，关于内在可拉伸性和形态稳健性的研究表明，高性能 IS-OSC 是迈向可延展电子纺织品实际应用的重要一步。