Wavelength and angle resolved reflectance measurements of pyramidal textures for crystalline silicon photovoltaics,Progress in Photovoltaics

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Wavelength and angle resolved reflectance measurements of pyramidal textures for crystalline silicon photovoltaics
Progress in Photovoltaics ( IF 8.0 ) Pub Date : 2020-07-09 , DOI: 10.1002/pip.3319
Tudor E. Scheul ₁ , Edris Khorani ₁ , Tasmiat Rahman ₁ , Martin D.B. Charlton ₁ , Stuart A. Boden ₁

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Wavelength and angle resolved scattering (WARS) reflectance measurements are attractive to the photovoltaic (PV) industry as a means of characterizing the light‐trapping properties of a textured front surface. Moreover, at the PV module level, where a stack comprising encapsulants and glass is present, large angle scattering can promote total internal reflection at the interfaces and redirect light back towards the solar cell, thus increasing the photocurrent of the device. In this work, we present WARS measurements of a potassium hydroxide (KOH)etched random pyramid surface in the 6°–90° range and identify the main paths the photons experience through reflections from various facets of the pyramids. Our results, combined with ray‐tracing predictions, show that a reassessment of the morphology for simulation inputs is advised for a more comprehensive description of the experimental light paths due to a distribution of power across multiple scattering angles and a lower average pyramid base angle. In addition, we discuss the implications on the total amount of light trapped at the glass‐air interface and show that for a typical encapsulant refractive index of 1.5, approximately 14.5% of the scattered light is predicted to be trapped by the fabricated pyramidal texture. This is a significant increase over the 3.8% calculated to be trapped when assuming a dihedral base angle fixed to 54.74°.

中文翻译：

晶体硅光伏电池金字塔结构的波长和角度分辨反射率测量

波长和角度分辨散射（WARS）反射率测量作为表征带纹理的前表面的光陷波特性的一种方法对于光伏（PV）工业很有吸引力。此外，在存在包含密封剂和玻璃的堆叠的PV模块级别上，大角度散射会促进界面处的全内反射，并使光重定向回到太阳能电池，从而增加了设备的光电流。在这项工作中，我们提出了在6°–90°范围内氢氧化钾（KOH）蚀刻的随机金字塔表面的WARS测量，并确定了光子通过金字塔各个侧面的反射而经历的主要路径。我们的结果与光线追踪预测相结合，结果表明，由于功率在多个散射角和较低的平均金字塔底角上的分布，建议对模拟输入的形态进行重新评估以更全面地描述实验光路。此外，我们讨论了对玻璃-空气界面处捕获的光总量的影响，并表明对于典型的1.5密封剂折射率，预计约有14.5％的散射光会被人造金字塔结构捕获。这比假设将二面角底角固定为54.74°时计算的要捕获的3.8％显着增加。我们讨论了对玻璃-空气界面处捕获的光总量的影响，并表明，对于典型的1.5密封剂折射率，预计约有14.5％的散射光被人造金字塔结构捕获。这比假设将二面角底角固定为54.74°时计算的要捕获的3.8％显着增加。我们讨论了对玻璃-空气界面处捕获的光总量的影响，并表明，对于典型的1.5密封剂折射率，预计约有14.5％的散射光被人造金字塔结构捕获。这比假设将二面角底角固定为54.74°时计算的要捕获的3.8％显着增加。

更新日期：2020-07-09

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