Multifunctional organized mesoporous tin oxide films templated by graft copolymers for dye-sensitized solar cells

Jung Tae Park, Sung Hoon Ahn, Dong Kyu Roh, Chang Soo Lee, Jong Hak Kim

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15 Citations (Scopus)

Abstract

The synthesis of organized mesoporous SnO2 films with high porosity, larger pores, and good interconnectivity, obtained by sol-gel templating with an amphiphilic graft copolymer, poly(vinyl chloride)-graft-poly(oxyethylene methacrylate), is reported. An improved performance of dye-sensitized solar cells (DSSCs) is demonstrated by the introduction of a 400 nm thick organized mesoporous SnO2 interfacial (om-SnO2 IF) layer between nanocrystalline TiO2 (nc-TiO2) and a fluorine-doped tin oxide substrate. To elucidate the improved efficiency, the structural, optical, and electrochemical properties of the devices were characterized by SEM, UV/Vis spectroscopy, noncontact 3D surface profilometry, intensity-modulated photocurrent/voltage spectroscopy, incident photon-to-electron conversion efficiency, and electrochemical impedance spectroscopy measurements. The energy-conversion efficiency of the solid polymerized ionic liquid based DSSC fabricated with the om-SnO2 IF/nc-TiO2 photoanode reached 5.9 % at 100 mW cm-2; this is higher than those of neat nc-TiO2 (3.5 %) and organized mesoporous TiO2 interfacial/nc-TiO2 layer (5.4 %) photoanodes. The improved efficiency is attributed to the antireflective property, cascadal energy band gap, good interconnectivity, and high electrical conductivity of the om-SnO2 IF layer, which results in enhanced light harvesting, increased electron transport, reduced charge recombination, and decreased interfacial/internal resistance. Peeling back the layers: An organized mesoporous SnO2 (om-SnO2) film is prepared using a graft copolymer as a template for dye-sensitized solar cells (DSSCs). The improved efficiency is attributed to the antireflective property, cascadal energy band gap, good interconnectivity, and high electrical conductivity of the film.

Original languageEnglish
Pages (from-to)2037-2047
Number of pages11
JournalChemSusChem
Volume7
Issue number7
DOIs
Publication statusPublished - 2014 Jul

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All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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