By introducing various low concentrations of Iridium complexes to the famous donor polymer of PTB7-Th backbone, new heavy metal containing terpolymers have been demonstrated. When blended with PC₇₁BM, an obvious increase of power conversion efficiency (PCE) is obtained in 1 mol% Ir containing polymer for different photovoltaic devices either using Ca or PDIN as cathode interface layers. The impact of molecular weight on the photovoltaic performance has been particularly considered by using three batches of control polymer PTB7-Th to ensure a fair and more convincing comparison. At similar molecular weight conditions (M_n: ~60 kg mol⁻¹, M_w: 100–110 kg mol⁻¹), the 1 mol% Ir containing PTB7-ThIr1/PC₇₁BM blends exhibits enhanced PCE to 9.19% compared with 7.92% of the control PTB7-Th. Through a combination of physical measurement, such as optoelectrical characterization, GIWAXS and pico-second time-resolved photoluminescence, the enhancement are contributed from comprehensive factors of higher hole mobility, less bimolecular recombination and more efficient slow process of charge separation.

通过将各种低浓度的铱配合物引入著名的PTB7-Th主链供体聚合物中，已证明了新的含重金属的三元共聚物。当与PC ₇₁ BM混合时，对于使用Ca或PDIN作为阴极界面层的不同光伏设备，在含1 mol％Ir的聚合物中，功率转换效率（PCE）明显增加。通过使用三批对照聚合物PTB7-Th，特别考虑了分子量对光伏性能的影响，以确保进行公平，更有说服力的比较。在相似的分子量条件下（M _n：〜60 kg mol ^-1，M _w：100–110 kg mol ^-1），含1 mol％Ir的PTB7-ThIr1 / PC ₇₁ BM共混物的PCE增强至9.19％，而对照PTB7-Th为7.92％。通过光电测量，GIWAXS和皮秒时间分辨光致发光等物理测量的结合，增强作用归因于更高的空穴迁移率，更少的双分子重组以及更高效的慢速电荷分离过程等综合因素。