Environmental sustainability and low toxicity of processing are vital for next-generation organic solar cells (OSCs). Herein, two halogen-free solvents carbon disulfide (CS₂) and ortho-xylene (o-XY) were used to illustrate the promising potential in additive-free non-fullerene OSCs with PM7 as the donor and IT-4F and IT-4Cl as the acceptors. The CS₂-processed pristine films show higher crystallinity than those processed by o-XY and the corresponding blend films exhibit higher and more balanced charge mobilities. Relative to o-XY as the solvent, the CS₂-processed blend films display lower absorption coefficients. As such, the CS₂-processed devices show higher open-circuit voltage and fill factor, but with lower short-circuit current density if compared with those processed by o-XY. Specially, the PM7:IT-4Cl based device processed by CS₂ solvent can obtain the highest power conversion efficiency (PCE) of 12.52% for conventional device, which is the highest PCE value in CS₂ casted single-junction OSCs so far. Furthermore, a high PCE of 12.31% for PM7:IT-4Cl is also achieved in inverted structure. This work implies that it is of great potential for the halogen-free and non-aromatic green solvent towards mass production.

环境的可持续性和较低的加工毒性对于下一代有机太阳能电池（OSC）至关重要。本文中，使用两种无卤溶剂二硫化碳（CS ₂）和邻二甲苯（o - XY）来说明以PM7为供体，IT-4F和IT-4Cl的无添加剂非富勒烯OSC的潜在潜力。作为接受者。CS ₂处理过的原始膜的结晶度高于o- XY处理过的原始膜，相应的共混膜显示出越来越高的平衡电荷迁移率。相对于邻-XY作为溶剂，CS ₂处理的共混膜显示出较低的吸收系数。因此，CS ₂处理过的器件显示出更高的开路电压和填充系数，但与通过o -XY处理的器件相比，短路电流密度更低。特别是，使用CS ₂溶剂处理过的PM7：IT-4Cl基器件可以实现传统器件最高的功率转换效率（PCE）为12.52％，这是迄今为止CS ₂浇铸单结OSC的最高PCE值。此外，在倒置结构中也实现了PM7：IT-4Cl的12.31％的高PCE。这项工作表明，无卤和非芳族绿色溶剂在大规模生产中具有巨大的潜力。