Efficiency improvement of dye-sensitized solar cells using graft copolymer-templated mesoporous TiO2 films as an interfacial layer

Sung Hoon Ahn, Harim Jeon, Kyung Jin Son, Hyungju Ahn, Won Gun Koh, Du Yeol Ryu, Jong Hak Kim

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Organized mesoporous TiO2 films with high porosity and good connectivity were synthesized via sol-gel by templating an amphiphilic graft copolymer consisting of poly(vinyl chloride) backbone and poly(oxyethylene methacrylate) side chains, i.e., PVC-g-POEM. The randomly microphase-separated graft copolymer was self-reorganized to exhibit a well-ordered micellar morphology upon controlling polymer-solvent interactions, as confirmed by atomic force microscope (AFM) and glazing incidence small-angle X-ray scattering (GISAXS). These organized mesoporous TiO2 films, 550 nm in thickness, were used an an interfacial layer between a nanocrystalline TiO2 thick layer and a conducting glass in dye-sensitized solar cells (DSSC). Introduction of the organized mesoporous TiO2 layer resulted in the increased transmittance of visible light, decreased interfacial resistance and enhanced electron lifetime. As a result, an energy conversion efficiency of DSSC employing polymer electrolyte was significantly improved from 3.5% to 5.0% at 100 mW cm-2.

Original languageEnglish
Pages (from-to)1772-1779
Number of pages8
JournalJournal of Materials Chemistry
Volume21
Issue number6
DOIs
Publication statusPublished - 2011 Feb 14

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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