4.6 Article

Efficient black silicon solar cell with a density-graded nanoporous surface: Optical properties, performance limitations, and design rules

Journal

APPLIED PHYSICS LETTERS
Volume 95, Issue 12, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.3231438

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Funding

  1. U. S. Department of Energy [DE-AC36-08GO28308]

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We study optical effects and factors limiting performance of our confirmed 16.8% efficiency black silicon solar cells. The cells incorporate density-graded nanoporous surface layers made by a one-step nanoparticle-catalyzed etch and reflect less than 3% of the solar spectrum, with no conventional antireflection coating. The cells are limited by recombination in the nanoporous layer which decreases short-wavelength spectral response. The optimum density-graded layer depth is then a compromise between reflectance reduction and recombination loss. Finally, we propose universal design rules for high-efficiency solar cells based on density-graded surfaces. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3231438]

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