In recent years, ternary blend bulk-heterojunction (BHJ) all-polymer solar cells have been gradually developed to better utilize the solar irradiance spectrum. However, power conversion efficiencies remain below 10%, mainly because of the low fill factor. Generally, the fill factor of all-polymer solar cells is limited mainly by the competition between the recombination and extraction of free charges. Here, we design advanced ternary blend all-polymer solar cells with a high fill factor of 78%, thus demonstrating how such recombination thresholds can be overcome. These results can be attributed to the high and balanced bulk charge mobility, reduced recombination, and optimized morphology, as well as the intimate mixing properties of the two donors in the photoactive layer.

近年来，三元共混本体-异质结（BHJ）全聚合物太阳能电池已逐步开发，以更好地利用太阳辐照光谱。但是，功率转换效率仍然低于10％，这主要是因为填充系数低。通常，全聚合物太阳能电池的填充因子主要受到自由电荷的重组和提取之间竞争的限制。在这里，我们设计了具有78％的高填充因子的高级三元共混全聚合物太阳能电池，从而证明了如何克服这种复合阈值。这些结果可归因于高且平衡的整体电荷迁移率，减少的重组和优化的形态，以及光敏层中两个施主的紧密混合特性。