3D simulations for the optimization of antireflection subwavelength structures in CIGS solar cells

2012 38th IEEE Photovoltaic Specialists Conference Pub Date : 2012-06-03 DOI:10.1109/PVSC.2012.6317739

Sehyun Hwang, Jae‐Hyung Jang

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引用次数: 3

Abstract

A three-dimensional simulation study was carried out for the optimum design of subwavelength structures (SWSs) on a CuIn1-xGaxSe2 (CIGS) solar cell regarding the antireflection properties. Numerical calculations were implemented for various shapes of SWSs with conic, parabolic, quadratic cross-sectional profiles, along with diverse CIGS composition ratios of x=0.2, 0.4, and 0.75. The reflectance was obtained successfully for individual configuration sets with subsequent computations of the effective reflectance. The simulated reflectance was found to be strongly dependent on the aspect ratio of the SWS, whereas it was highly insensitive to the thickness of the ZnO layer. The effective reflectance drops to approximately 5% and below 2% when the aspect ratio is 1 and 2, respectively. The simulation result indicates that a cone-shaped SWS enhances the transmittance more effectively than parabolic and quadratic SWSs. The reflectance of the optimized SWS was also compared to that of a CIGS solar cell with conventional MgF2 antireflection coatings (ARCs). Multi-layer SWSs tend to be the most efficient surface structure with broadband and wide-angle antireflection.

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CIGS太阳能电池抗反射亚波长结构优化的三维模拟

对CuIn1-xGaxSe2 (CIGS)太阳能电池的亚波长结构(SWSs)的抗反射性能进行了三维仿真研究。在不同的CIGS组成比x=0.2、0.4和0.75的情况下，对具有圆锥、抛物线和二次截面的不同形状的SWSs进行了数值计算。成功地获得了各个构型集的反射率，并进行了有效反射率的计算。模拟反射率与SWS的宽高比密切相关，而对ZnO层的厚度不敏感。当纵横比为1和2时，有效反射率分别降至5%左右和2%以下。仿真结果表明，锥形单波束比抛物线型和二次型单波束更有效地提高了透光率。将优化后的SWS的反射率与具有传统MgF2增透涂层的CIGS太阳能电池的反射率进行了比较。多层SWSs往往是最有效的表面结构，具有宽带和广角增透。

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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2012 38th IEEE Photovoltaic Specialists Conference

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