为了提高顶入射有机薄膜太阳能电池(TOSCs)的光吸收效率, 我们将周期性矩形光栅结构引入到TOSCs中, 分析了具有光栅结构的空气/Ag1/有源层/Ag2/空气(IMIMI)结构理想模型中复合表面等离子激元(SPPs)与微腔模式的耦合机制。通过调节光栅周期和有源层厚度, 实现了复合SPPs、微腔模式以及有机材料本征吸收3个区域的重合。由于复合SPPs与微腔模式的反交叉耦合作用形成了表面等离子体-微腔激元, 其局域场增强作用有效地提高了有源层的光吸收效率, 提高了近19%。

The absorption efficiency of top-incident organic thin-film solar cells(TOSCs) was improved by employing rectangle grating structure. The coupling mechanism between the hybridized surface plasmon polariatons and microcavity modes in ideal model of air/Ag1/active layer/Ag2/air (IMIMI) structure was analyzed. By tuning the period of the grating and the thickness of the active layer, the resonance region of the hybridized surface plasmon polaritons and microcavity modes are matched with the intrinsic absorption range of the organic materials. Due to the electric field enhancement effect of plasmon-cavity polaritons formed by the anticross-coupling between the microcavity modes and the surface plasmon polaritons, the absorption efficiency of the active layer is increased obviously, exhibits a increment of 19%.