Flexible organic solar cells (OSCs) with high power conversion efficiency (PCE) and excellent mechanical properties are considered a promising power source for wearable electronic devices. However, simultaneously achieving high efficiency and robust mechanical stability is still challenging because highly crystalline or aggregated microstructures that are thought to be critical for enabling efficient device operation render the active layer brittle. In this study, we demonstrate 3-μm-thick ultraflexible OSCs by utilizing a mixed fullerene/non-fullerene acceptor that can achieve an efficiency of 13% (certified value of 12.3%) with 97% retention in the PCE after 1,000 bending cycles (bending radius of 0.5 mm). In addition, although ultraflexible OSCs cannot survive under the intrinsic tensile test with a large strain, they exhibit excellent mechanical behavior under the cyclic compression-stretching test via the formation of a buckling device structure, yielding an 89% retention in the PCE after 1,000 cycles (45% compression and bending radius of 10 μm). A facile approach introducing a small amount of high-electron-mobility fullerene acceptor into a non-fullerene binary blend enhances charge transport, improves exciton separation, and optimizes the blend morphology with more amorphous regions, thus producing a more efficient and mechanically robust device.

具有高功率转换效率（PCE）和出色机械性能的柔性有机太阳能电池（OSC）被认为是可穿戴电子设备的有前途的电源。然而，同时实现高效率和鲁棒的机械稳定性仍是挑战，因为高度结晶或聚集的微观结构被认为对实现有效的器件操作至关重要，因此使活性层易碎。在这项研究中，我们通过使用混合的富勒烯/非富勒烯受体展示了3μm厚的超柔OSC，在1,000个弯曲周期后，其效率可达到13％（认证值为12.3％），在PCE中的保留率为97％（弯曲半径为0.5毫米）。此外，尽管超柔OSC在大应变的固有拉伸试验下无法幸存，通过形成屈曲装置结构，它们在循环压缩拉伸试验中表现出出色的机械性能，在1,000次循环后（45％压缩和10μm的弯曲半径）在PCE中保持89％的保留率。一种简便的方法将少量高电子迁移率富勒烯受体引入非富勒烯二元共混物中，可增强电荷传输，改善激子分离，并优化具有更多非晶区域的共混物形态，从而生产出更高效且机械强度更高的器件。