Bifunctional moth-eye nanopatterned dye-sensitized solar cells: Light-harvesting and self-cleaning effects

Sung Yeon Heo, Jong Kwan Koh, Gumin Kang, Sung Hoon Ahn, Won Seok Chi, Kyoungsik Kim, Jong Hak Kim

Research output: Contribution to journalArticle

56 Citations (Scopus)


A nanopatterning technique using nanostamps that provides a facile process to create a nature-inspired moth-eye structure achieving high transmittance in the visible range as well as a self-cleaning effect is reported. Commercially available perfluoropolyether (PFPE) and NOA63 as the mold resin and second replica mold material, respectively, play an important role in fabricating the structure. The structure is found to increase transmittance up to 82% at 540 nm and contact angle up to 150°, representing superhydrophobicity even without the aid of a fluorinated self-assembled monolayer (SAM) coating. The resulting solid-state dye-sensitized solar cells (ssDSSCs) with moth-eye structures show enhancement of efficiency to 7.3% at 100 mW cm-2, which is among the highest values reported to date for N719 dye-based ssDSSCs. This nature-inspired nanopatterning process could be used for improving light harvesting in any type of photovoltaic cell, and it produces superhydrophobic surfaces, which in turn lead to self-cleaning for long-term stability. A nature-inspired moth-eye structure is created via a facile nanopatterning technique using polymeric nanostamps. The resulting solid-state dye-sensitized solar cells show enhancement of efficiency to 7.3% at 100 mW cm-2, which is one of the highest values observed for N719 dye.

Original languageEnglish
Article number1300632
JournalAdvanced Energy Materials
Issue number3
Publication statusPublished - 2014 Feb 18


All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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