Enhanced power conversion efficiency of dye-sensitized solar cells with multifunctional photoanodes based on a three-dimensional TiO2 nanohelix array

Seung Hee Lee, Jeong Kwon, Dong Yeong Kim, Kyung Song, Sang Ho Oh, Jaehee Cho, E. Fred Schubert, Jong Hyeok Park, Jong Kyu Kim

Research output: Contribution to journalArticle

25 Citations (Scopus)


Developments of metal oxide nanostructures for simultaneous improvements in light harvesting and charge collection can lead to a significant technical progress in various applications such as photoelectrodes for photoelectrochemical cells and various types of solar cells. Here we present an array of three-dimensional titanium dioxide (TiO2) nanohelixes infiltrated with TiO2 nanoparticles as a multifunctional photoanode for dye sensitized solar cells (DSSCs). The unique geometry and the near-single crystallinity of the vertically aligned TiO2 nanohelix array results simultaneously in strong light scattering and enhanced carrier transport and collection, while maintaining a comparable surface area accessible for dye molecules by the infiltrated TiO2 nanoparticles. Consequently, despite a ~40% reduction in dye loading, the overall photon conversion efficiency of the DSSC with the nanoparticle-infiltrated nanohelix-array photoanode is enhanced by 6.2% in comparison with the DSSC with the conventional nanoparticle photoanode.

Original languageEnglish
Pages (from-to)47-55
Number of pages9
JournalSolar Energy Materials and Solar Cells
Publication statusPublished - 2015 Jan


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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