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

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6 Author(s)
Yuan, Hao-Chih ; National Renewable Energy Laboratory, Golden, Colorado 80401, USA ; Yost, Vernon E. ; Page, Matthew R. ; Stradins, Paul
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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.

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Applied Physics Letters  (Volume:95 ,  Issue: 12 )