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Embedded metallic nanopatterns for enhanced optical absorption

机译:嵌入式金属纳米图案可增强光吸收

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Novel metallic nanopatterns integrated with semiconductor films form optical metamaterials that can enable enhanced absorption. When employed in photovoltaics, such integrated nanostructures may facilitate significant increases in power conversion efficiency. Here, we show that metal nanopatterns embedded within a semiconductor, as opposed to being situated at/on the surface(s), exhibit absorbance enhancements that exceed those yielded by surface patterns. We show in computer simulations and experiments that absorbance in amorphous silicon can be enhanced many-fold for embedded metal nanopatterns (EMN) in ultrathin silicon films in particular wavelength regimes. Compared to plane a-Si films of comparable thickness, a several hundred percent enhancement is observed. This represents a potential route to high efficiency solar power with ultrathin absorbers enhanced by EMN-based optical metamedia.
机译:与半导体膜集成在一起的新型金属纳米图案形成了光学超材料,可以增强吸收。当用于光伏中时,这样的集成纳米结构可以促进功率转换效率的显着提高。在这里,我们表明,与位于表面上或表面上相反,嵌入半导体中的金属纳米图案显示出超过表面图案产生的吸收增强。我们在计算机模拟和实验中显示,对于特定波长范围内的超薄硅膜中的嵌入式金属纳米图案(EMN),非晶硅中的吸收可以提高许多倍。与相当厚度的平面a-Si膜相比,可以观察到百分之百的增强。这代表了通过基于EMN的光学元媒体增强的超薄吸收器获得高效太阳能的潜在途径。

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