Photonic assisted light trapping integrated in ultrathin crystalline silicon solar cells by nanoimprint lithography

Christos Trompoukis, Ounsi El Daif, Valérie Depauw, Ivan Gordon, Jef Poortmans

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We report on the fabrication of two-dimensional periodic photonic nanostructures by nanoimprint lithography and dry etching and their integration into a 1-μm-thin mono-crystalline silicon solar cell. Thanks to the periodic nanopatterning, a better in-coupling and trapping of light is achieved, resulting in an absorption enhancement. The proposed light trapping mechanism can be explained as the superposition of a graded index effect and of the diffraction of light inside the photoactive layer. The absorption enhancement is translated into a 23% increase in short-circuit current, as compared to the benchmark cell, resulting in an increase in energy-conversion efficiency.

Original languageEnglish
Article number103901
JournalApplied Physics Letters
Issue number10
Publication statusPublished - 3 Sep 2012
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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