Non-plasmonic light trapping for thin film solar cells

A. Shalin, C. Simovski, P. Voroshilov, P. Belov
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Abstract

We propose the enhancement of the photovoltaic absorption in thin-film solar cells using densely-packed arrays (not obviously regular) of non-absorbing submicron or micron-sized non-plasmonic spheres located on top of the cell. The spheres can decrease reflection forming an effective blooming layer but simultaneously they can suppress the transmission through the photovoltaic layer transforming the incident radiation into a set of collimated beams. The focusing of the light inside the photovoltaic layer allows enhanced useful absorption in it leading to the increment of the photovoltaic current. Every sphere focuses the incident wave separately - this mechanism does not require collective effects or resonances and is therefore takes place in a wide spectral range. Since the fabrication of such the coating is easy, our light-trapping structure may be cheaper than previously known light-trapping ones and perhaps even than flat anti-reflecting coatings.
薄膜太阳能电池的非等离子体光捕获
我们建议在薄膜太阳能电池中使用位于电池顶部的非吸收亚微米或微米尺寸的非等离子体球的密集排列(不明显规则)来增强光伏吸收。球体可以减少反射,形成有效的绽放层,但同时它们可以抑制通过光伏层的透射,将入射辐射转化为一组准直光束。光在光伏层内的聚焦允许增强其中的有用吸收,从而导致光伏电流的增加。每个球体分别聚焦入射波-这种机制不需要集体效应或共振,因此在很宽的光谱范围内发生。由于这种涂层的制造很容易,我们的捕光结构可能比以前已知的捕光结构更便宜,甚至可能比平面抗反射涂层更便宜。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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