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Patterning the front side of an ultra-thin crystalline silicon (c Si) solarcell helps keeping the energy conversion efficiency high by compensating forthe light absorption losses. A super-Gaussian mathematical expression was usedin order to encompass a large variety of nanopattern shapes and to study theirinfluence on the photonic performance. We prove that the enhancement in themaximum achievable photo-current is due to both impedance matching condition atshort wavelengths and to the wave nature of light at longer wavelengths. Weshow that the optimal mathematical shape and parameters of the pattern dependon the c Si thickness. An optimal shape comes with a broad optimal parameterzone where fabricating errors would have much less influence on the efficiency.We prove that cylinders are not the best suited shape. To compare our modelwith a real slab, we fabricated a nanopatterned c Si slab via Nano ImprintLithography.

Influence of the pattern shape on the photonic efficiency of front-side periodically patterned ultrathin crystalline silicon solar cells