Despite metallic plasmonic excitations can enhance the performance of ultra-thin solar cells however these so-called plasmonic solar cells suffer from a large resistive (Ohmic) loss caused by metallic elements. In this work, we report on a new design that uses graphene nanoribbons (GNRs) in a two-dimensional (2D) grating form at the top of the semiconductor-on-insulator (SOI) solar cells aimed to reduce the resistive loss. The results showed that GNRs can remarkably reduce the resistive loss compared to the SOI cell with Ag nanograting, while keeping all other cell’s parameters, comparable with those of Ag SOI cell. Optical absorption and short-circuit current density of the graphene cells showed, respectively, enhancements of 18 and 1.7 times when optimizations were done with respect to width and the grating period. Our calculations showed that the graphene solar cells dissipate at most 5% of incident sunlight power as narrow and tiny peaks around 508 nm, which is noticeably lower than those of Ag solar cells with high and broad band peaks with the maximum values of 29% at 480 nm and 24% at 637 nm.

中文翻译：

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高性能低电阻损耗石墨烯太阳能电池的设计

尽管金属等离子体激元激发可以增强超薄太阳能电池的性能，但是这些所谓的等离子体激元太阳能电池遭受由金属元素引起的大的电阻（欧姆）损耗。在这项工作中，我们报告了一种新设计，该设计在绝缘体上半导体（SOI）太阳能电池的顶部使用二维（2D）光栅形式的石墨烯纳米带（GNR），旨在减少电阻损耗。结果表明，与使用银纳米光栅的SOI电池相比，GNR可以显着降低电阻损耗，同时保持所有其他电池参数与Ag SOI电池相当。当对宽度和光栅周期进行优化时，石墨烯电池的光吸收和短路电流密度分别显示出18倍和1.7倍的增强。