The power conversion efficiency (PCE) of ternary organic solar cells (OSCs) based on PTB7-Th:PCDTBT:PC₇₀BM with good air stability needs to be further improved. We report here 2 min methanol solvent treatment of the active layer of ternary OSCs based on PTB7-Th:PCDTBT:PC₇₀BM can significantly boost efficiency up to 9.60%, which exhibits a 30.4% improvement compared to that of 7.36% for the device without methanol solvent treatment. The performance improvement is mainly due to the enhanced light absorption, efficient charge transfer and optimized bulk morphology in the ternary active layer. Meanwhile, the air stability of the methanol solvent treated device can be clearly improved by the removal of residual DIO in the active layer. The PCE of the 2 min methanol treated device could retain 95.4% of the initial value after 7 days of storage in air. Our results indicate that methanol solvent treatment is a simple but effective strategy to boost efficiency and air stability of ternary OSCs based on PTB7-Th:PCDTBT:PC₇₀BM.

具有良好空气稳定性的基于PTB7-Th：PCDTBT：PC ₇₀ BM的三元有机太阳能电池（OSC）的功率转换效率（PCE）需要进一步提高。我们在这里报告基于PTB7-Th：PCDTBT：PC ₇₀的三元OSC活性层的2分钟甲醇溶剂处理BM可以将效率显着提高至9.60％，与未进行甲醇溶剂处理的设备的7.36％相比，其效率提高了30.4％。性能的提高主要归因于三元活性层中增强的光吸收，有效的电荷转移和优化的本体形态。同时，通过除去活性层中残留的DIO，可以明显改善甲醇溶剂处理过的装置的空气稳定性。在空气中存储7天后，用甲醇处理2分钟的设备的PCE可以保留初始值的95.4％。我们的结果表明，基于PTB7-Th：PCDTBT：PC ₇₀ BM ，甲醇溶剂处理是提高三元OSC效率和空气稳定性的简单而有效的策略。