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The photonic light trap - Improved light trapping in solar cells by angularly selective filters

: Peters, M.; Goldschmidt, J.C.; Kirchartz, T.; Bläsi, B.


Solar energy materials and solar cells 93 (2009), No.10, pp.1721-1727
ISSN: 0927-0248
Journal Article
Fraunhofer ISE ()

A photonic light trap, i.e. a combination of an angularly selective filter and a light scattering process in a solar cell, results in potentially very efficient light trapping. Angularly selective filters are investigated theoretically and experimentally. One of the filters is used to realize a photonic light trap for a thin-film solar cell with amorphous-silicon absorber layer on a roughened superstrate. We experimentally demonstrate that the light absorption in this solar cell is enhanced by 25% in a wavelength range of 700-750 nm. Accordingly, the quantum efficiency of the solar cell demonstrates an increase of 25% in the same wavelength range.