TITLE

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

AUTHOR(S)
Hao-Chih Yuan; Yost, Vernon E.; Page, Matthew R.; Stradins, Paul; Meier, Daniel L.; Branz, Howard M.
PUB. DATE
September 2009
SOURCE
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p123501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
44374772

 

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