The addition of a third component to a donor:acceptor blend is a powerful tool to enhance the power conversion efficiency of organic solar cells. Featuring a similar operating mechanism, organic photodetectors are also expected to benefit from this approach. Here, we fabricated ternary organic photodetectors, based on a polymer donor and two nonfullerene acceptors, resulting in a low dark current of 0.42 nA cm⁻² at −2 V and a broadband specific detectivity of 10¹² Jones. We found that exciton recombination in the binary blend is reduced in ternary devices due to the formation of a pseudo-binary microstructure with mixed donor–acceptor phases. With this approach a wide range of intermediate open-circuit voltages is accessible, without sacrificing light-to-current conversion. This results in ternary organic photodetector (TOPD) with improved Responsivity values in the near-infrared. Moreover, morphology analyses reveal that TOPD devices showed improved microstructure ordering and consequentially higher charge carrier mobilities compared to the reference devices.

向供体：受体混合物中添加第三种成分是提高有机太阳能电池功率转换效率的有力工具。具有类似操作机制的有机光电探测器也有望从这种方法中受益。在这里，我们制造了基于聚合物供体和两个非富勒烯受体的三元有机光电探测器，在 -2 V 下产生了 0.42 nA cm ^-2的低暗电流和 10 ¹²琼斯。我们发现，由于形成了具有混合供体 - 受体相的伪二元微结构，二元混合物中的激子复合在三元器件中减少。通过这种方法，可以在不牺牲光到电流转换的情况下获得广泛的中间开路电压。这导致三元有机光电探测器 (TOPD) 具有改进的近红外响应率值。此外，形态分析表明，与参考器件相比，TOPD 器件显示出改善的微观结构有序性和相应更高的电荷载流子迁移率。