Light trapping with titanium dioxide diffraction gratings fabricated by nanoimprinting

Er Chien Wang, Sudha Mokkapati, Tom P. White, Thomas Soderstrom, Sergey Varlamov, Kylie R. Catchpole

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)


Dielectric scattering structures are a promising way of trapping light in solar cells. Titanium dioxide is a particularly attractive candidate material because of its high refractive index and ability to be deposited on a finished solar cell. Here, we present an experimental demonstration of photocurrent enhancement in thin film recrystallised silicon solar cells using TiO2 pillar arrays fabricated on the rear of the cells using nanoimprint lithography. A short circuit current enhancement of 19% is measured experimentally, and excellent agreement with numerical simulations is obtained. We show numerically that by replacing the Ag capping present on the cells with a detached rear Ag back reflector, the enhancement could reach 37%.

Original languageEnglish
Pages (from-to)587-592
Number of pages6
JournalProgress in Photovoltaics: Research and Applications
Issue number5
Publication statusPublished - 1 May 2014
Externally publishedYes


  • diffraction gratings
  • light trapping
  • nanoimprinting
  • solar cells
  • TiO

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