Mennucci C, Del Sorbo S, Pirotta S, Galli M, Andreani L C, Martella C, Giordano M C, Buatier de Mongeot F
Department of Physics, University of Genova, Via Dodecaneso 33, I-16146 Genova, Italy.
Nanotechnology. 2018 Aug 31;29(35):355301. doi: 10.1088/1361-6528/aac9ac. Epub 2018 Jun 1.
We investigate the scattering properties of novel kinds of nano-textured substrates, fabricated in a self-organized fashion by defocused ion beam sputtering. These substrates provide strong and broadband scattering of light and can be useful for applications in thin-film solar cells. In particular, we characterize the transmitted light in terms of haze and angle-resolved scattering, and we compare our results with those obtained for the commonly employed Asahi-U texture. The results indicate that the novel substrate has better scattering properties compared to reference Asahi-U substrates. We observe super-Lambertian light scattering behavior in selected spectral and angular regions due to the peculiar morphology of the nano-textured interface, which combines high aspect ratio pseudo random structures with a one-dimensional periodic pattern. The enhancement of light absorption observed in a prototype thin film semiconductor absorber grown on nano-textured glass with respect to an Asahi-U substrate further confirms the superior light trapping properties of the novel substrate.
我们研究了通过散焦离子束溅射以自组织方式制造的新型纳米纹理衬底的散射特性。这些衬底能提供强烈且宽带的光散射，可用于薄膜太阳能电池应用。特别地，我们根据雾度和角分辨散射来表征透射光，并将我们的结果与常用的旭化成（Asahi-U）纹理所获得的结果进行比较。结果表明，与参考的旭化成衬底相比，新型衬底具有更好的散射特性。由于纳米纹理界面的特殊形态，在选定的光谱和角度区域观察到超朗伯光散射行为，该形态将高纵横比的伪随机结构与一维周期性图案结合在一起。在纳米纹理玻璃上生长的原型薄膜半导体吸收体相对于旭化成衬底观察到的光吸收增强，进一步证实了新型衬底具有优异的光捕获特性。
