Optimizing the morphology of the photoactive layer by additives strategy is one of the successful methods for increasing efficiency in organic solar cells (OSCs). In this work, a halogen-free solvent additive, methoxy methyl phenyl sulfide (MMPS) added to the PTB7-Th:PC₇₁BM-based system to improve the optoelectronic property for OSCs by modulating the phase separation and crystallinity in the photoactive layer. It is found that the addition of MMPS could well modulate the aggregation and diffusion of donor and acceptor to form an excellent bicontinuous interpenetrating network, which improved exciton dissociation enhanced charge transport and significantly inhibited charge recombination. Consequently, the PCE of device based on the PTB7-Th:PC₇₁BM blend with 3% MMPS is 9.24%, which is a 92.5% efficiency improvement compared to the device without additives. These results indicate that our work effectively optimizes the performance parameters of devices, providing new ideas for the preparation of OSCs on a large scale and industrialization.

通过添加剂策略优化光活性层的形态是提高有机太阳能电池 (OSC) 效率的成功方法之一。在这项工作中，将无卤溶剂添加剂甲氧基甲基苯硫醚 (MMPS) 添加到基于 PTB7-Th:PC ₇₁ BM 的系统中，通过调节光活性层中的相分离和结晶度来改善 OSC 的光电特性。发现MMPS的加入可以很好地调节供体和受体的聚集和扩散，形成优良的双连续互穿网络，改善激子解离，增强电荷传输，显着抑制电荷复合。因此，基于 PTB7-Th:PC _{71的器件的 PCE}含 3% MMPS 的 BM 混合物为 9.24%，与不含添加剂的装置相比，效率提高了 92.5%。这些结果表明我们的工作有效地优化了器件的性能参数，为大规模制备OSCs和产业化提供了新的思路。