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Investigation of Textured Back Reflectors With Periodic Honeycomb Patterns in Thin-Film Silicon Solar Cells for Improved Photovoltaic Performance

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3 Author(s)
Sai, H. ; Nat. Inst. of Adv. Ind. Sci. & Technol., Tsukuba, Japan ; Saito, K. ; Kondo, M.

Periodically textured back reflectors with a honeycomb dimple pattern are investigated for improving the infrared response and conversion efficiency in substrate-type microcrystalline (μc-Si:H) silicon solar cells. For 1-μm-thick μc-Si:H cells, the best current density is obtained at the period of 1.4 μm, while a substantial enhancement in the external quantum efficiency is achievable in a wide range of period of 1-2 μm. In addition, photocurrent of the cells is improved with increasing the aspect ratio of the honeycomb textures. As a result of a high open-circuit voltage and fill factor, as well as the improved current densities, high conversion efficiencies of 9.4% and 9.9% are realized in the 1-μm-thick and 2-μm-thick μc-Si:H cells, respectively.

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Photovoltaics, IEEE Journal of  (Volume:3 ,  Issue: 1 )