17 May 2011 PN junction fabrication of solar cells and integration with metamaterials
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Silicon is the primary material used for the fabrication of solar cells and it is responsible for about 40% of the cost. Metamaterials show promise in enhancing the performance of silicon solar cells thus, improving the efficiency. Here we report on the fabrication of a broadband, antireflective, conductive metamaterial capable of channeling light into a solar cell. As a precursor to making the metamaterial, standard p-n junctions were fabricated. Conventional phosphorus oxychloride (POCl3) furnace diffusion was used to create the p-n junction. When the p-n junction was forward biased, the measured current exhibited a diode characteristic. The measured photocurrent response yielded an open circuit voltage for the p-n junction at 0.48 VDC. The metamaterial film was fabricated, placed atop the p-n junction and characterized. Initial tests showed that the metamaterial antireflective properties were on par with those of standard industrial single-layer silicon nitride coatings. Further testing is being performed to assess the full optical and electrical performance of the metamaterial film.
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Amarachukwu Enemuo, David T. Crouse, Michael Crouse, "PN junction fabrication of solar cells and integration with metamaterials", Proc. SPIE 8070, Metamaterials VI, 80700W (17 May 2011); doi: 10.1117/12.887124; https://doi.org/10.1117/12.887124

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