A broadband-absorption enhancement in two kinds of polymer-based organic solar cells (OSCs) is demonstrated in this work by employing micro-nano composite gratings (MNCGs). The structure of MNCGs is nano-grating covering on the surface of micro-grating. By embedding the MNCGs at the interface of the active layer/Ag cathode, the multi-absorption-enhancement mechanisms, such as dual-microcavity resonance, plasmon-cavity polaritons and light-scattering effects, are excited and result in a broadband-absorption enhancement. The light absorption of active layer in the MNCG-based OSC is numerically calculated. As a result, comparing to the planar OSCs, the absorption intensity is increased by 50.41% and 20.43% in these two kinds of polymer-based OSCs, respectively. Meanwhile, the MNCGs can also be universally used in all kinds of polymer-based OSCs to increase the light absorption of the active layer.

在这项工作中，通过使用微纳米复合光栅（MNCG）展示了两种基于聚合物的有机太阳能电池（OSC）的宽带吸收增强。MNCGs的结构是覆盖微光栅表面的纳米光栅。通过将MNCG嵌入活性层/ Ag阴极的界面，可以激发多重吸收增强机制，例如双微腔共振，等离子体激元腔极化子和光散射效应，并导致宽带吸收增强。 。在基于MNCG的OSC中，对活性层的光吸收进行了数值计算。结果，与平面OSC相比，在这两种基于聚合物的OSC中，吸收强度分别增加了50.41％和20.43％。同时，