图案形状对正面周期性图案化单晶硅太阳电池光子效率的影响
Influence of the pattern shape on the photonic efficiency of front-side periodically patterned ultrathin crystalline silicon solar cells
摘要：
对超薄晶体硅（c Si）太阳能电池的正面进行图案化有助于通过补偿光吸收损失来保持高能量转换效率。一个超高斯的数学表达式，以涵盖各种各样的纳米图案的形状，并研究它们对光子性能的影响。我们证明了最大可达光电流的增强是由于短波长处的阻抗匹配条件和长波长处光的波动性质。我们表明，最佳的数学形状和参数的图案依赖于c Si的厚度。一个最佳的形状与一个广泛的最佳参数区，其中制造误差将有小得多的影响，对效率。我们证明了圆柱体不是最合适的形状。为了将我们的模型与真实板进行比较，我们通过纳米压印光刻制造了纳米图案化的c Si板。
英文摘要：
Patterning the front side of an ultra-thin crystalline silicon (c Si) solar cell helps keeping the energy conversion efficiency high by compensating for the light absorption losses. A super-Gaussian mathematical expression was used in order to encompass a large variety of nanopattern shapes and to study their influence on the photonic performance. We prove that the enhancement in the maximum achievable photo-current is due to both impedance matching condition at short wavelengths and to the wave nature of light at longer wavelengths. We show that the optimal mathematical shape and parameters of the pattern depend on the c Si thickness. An optimal shape comes with a broad optimal parameter zone where fabricating errors would have much less influence on the efficiency. We prove that cylinders are not the best suited shape. To compare our model with a real slab, we fabricated a nanopatterned c Si slab via Nano Imprint Lithography.
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