All polymer solar cells (all-PSCs), compared to fullerene or non-fullerene small molecule based solar cells possess the merits of high morphological stability, good film forming properties and superior mechanical flexibility. However, in contrast to the rapid progress in molecule-design and device engineering in this field, our fundamental insights into key photo-physical parameters that govern the device characteristics still lag behind. Here, based on state of the art PTzBI:N2200 all-PSCs with efficiencies of ∼9% compared with PBDB-T:N2200 all-PSCs, we investigate properties of charge transport, bimolecular recombination, energetic disorder and voltage losses. We show that expedited charge extraction with weaker bias-dependence in the PTzBI:N2200 cell results in the reduction of bimolecular recombination, which explains the increases in photocurrent and fill factor. Further mitigation of the voltage losses in this high performance all-polymer system may be allowed by decreasing the energetic disorder in PTzBI:N2200 bulk heterojunctions through delicate morphological optimization.

中文翻译：

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了解全聚合物太阳能电池的能量紊乱，电荷复合和电压损失†

与基于富勒烯或基于非富勒烯的小分子的太阳能电池相比，所有聚合物太阳能电池（all-PSC）均具有高形态稳定性，良好的成膜性和出色的机械柔韧性。但是，与该领域分子设计和器件工程学的快速发展相比，我们对控制器件特性的关键光物理参数的基本见识仍然落后。在此，基于最先进的PTzBI：N2200全PSC与PBDB-T：N2200全PSC相比，效率约为9％，我们研究了电荷传输，双分子重组，高能紊乱和电压损耗的特性。我们表明，在PTzBI：N2200细胞中具有较弱的偏倚依赖性的快速电荷提取会导致双分子重组的减少，这解释了光电流和填充因子的增加。可以通过精细的形态优化来降低PTzBI：N2200本体异质结中的能量紊乱，从而进一步减轻这种高性能全聚合物系统中的电压损耗。