Recently, efficient thick-film polymer solar cells (PSCs) were reported to be promising candidates for large-area module device fabrication because of their potential compatibility with roll to roll processing technique. Nevertheless, most of thick-film PSCs with high power conversion efficiencies (PCEs) were fabricated under high temperature (over 100 °C, namely “Hot-Processing”), which restricts their potential commercialization application. Herein, a new pathway was developed to make high performance thick-film PSCs under a mild condition without hot-processing. It was found that the ternary strategy can efficiently tune the processing conditions of thick film PSCs due to the decrease of polymer aggregation intensity. Consequently, high-efficiency thick-film ternary PSCs (10.59%) without hot-processing are designed and fabricated by introducing the nematic liquid-crystalline small molecule (benzodithiophene terthiophene rhodanine, BTR) into fluorinated benzothiadiazole-based polymer (PffBT4T-2OD):fullerene host blend. The morphology studies reveal that the incorporation of BTR has a similar effect as hot-processing on the blend films, resulting in a much improved nano-scale phase separation. It was also demonstrated that the addition of BTR is beneficial for improving light harvesting, charge separation, transport and extraction of the resulting devices. Moreover, this ternary strategy shows a well general applicability for other systems that need hot-processing. Such as for naphthobisthiadiazole-based polymer PNTT, the optimized ternary device without hot-processing obtained an improved performance with a PCE of 11.44%, which is one of the highest-efficiency thick-film PSCs reported to date. Therefore, our results provide a facile approach to fabricate the high performance PSCs with thick-active layer at a lower temperature instead of hot-processing and may meet the needs of future roll-to-roll production of PSCs.

近来，据报道有效的厚膜聚合物太阳能电池（PSC）由于与卷对卷加工技术具有潜在的兼容性，因此有望成为大面积模块设备制造的候选材料。然而，大多数具有高功率转换效率（PCE）的厚膜PSC都是在高温（超过100°C，即“热加工”）下制造的，这限制了它们潜在的商业化应用。本文中，开发了一种新途径，以在温和条件下无需热处理即可生产高性能厚膜PSC。发现由于聚合物聚集强度的降低，三元策略可以有效地调节厚膜PSC的加工条件。因此，高效的厚膜三元PSC（10。ffBT4T-2OD）：富勒烯主体混合物。形态学研究表明，BTR的掺入与共混膜上的热加工具有相似的效果，从而大大改善了纳米级相分离。还证明了添加BTR对于改善所得器件的光收集，电荷分离，运输和提取是有益的。而且，这种三元策略对需要热处理的其他系统显示出很好的通用性。例如，对于基于萘二噻二唑的聚合物PNTT，优化的三元器件无需进行热加工即可获得11.44％的PCE，这是迄今为止报道的效率最高的厚膜PSC之一。所以，