 highlights two series of terpolymers with improved photo-stability were realized by the introduction of appropriate ratio of antioxidant-butylated hydroxyl toluene unit containing side chains. All polymer solar cells and organic photo detectors, OPDs, with these terpolymers as both donors and acceptors have been prepared with simultaneously improved efficiency and stability. A feasible approach to develop terpolymers with antioxidant efficacy for improving the lifetime of organic solar cells and OPDs is proposed. This article was authored by Chunying Zhang, Aosong, Kiri Huang, and others.