Honeycomb-like organized TiO2 photoanodes with dual pores for solid-state dye-sensitized solar cells

Sung Hoon Ahn, Won Seok Chi, Dong Jun Kim, Sung Yeon Heo, Jong Hak Kim

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

A solid-state dye-sensitized solar cell (ssDSSC) with 7.4% efficiency at 100 mW/cm2 is reported. This efficiency is one of the highest observed for N719 dye. High performance is achieved via a honeycomb-like, organized mesoporous TiO2 photoanode with dual pores, high porosity, good interconnectivity, and excellent light scattering properties. The TiO 2 photoanodes are prepared without any TiCl4 treatment via a one-step, direct self-assembly of hydrophilically preformed TiO2 nanocrystals and poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) graft copolymer as a titania source and a structure-directing agent, respectively. Upon controlling the secondary forces between the polymer/TiO2 hybrid and the solvent by varying the amounts of HCl/H2O mixture or toluene, honeycomb-like structures are generated to improve light scattering properties. Such multifunctional nanostructures with dual pores provide good pore-filling of solid polymer electrolyte with large volume, enhanced light harvesting and reduced charge recombination, as confirmed by reflectance spectroscopy, incident photon-to-electron conversion efficiency (IPCE), and electrochemical impedance spectroscopy (EIS) analysis.

Original languageEnglish
Pages (from-to)3901-3908
Number of pages8
JournalAdvanced Functional Materials
Volume23
Issue number31
DOIs
Publication statusPublished - 2013 Aug 19

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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