Impact of drying procedure on the morphology and structure of TiO2 xerogels and the performance of dye sensitized solar cells

Mihai M. Rusu, Ruri A. Wahyuono, Carmen Ioana Fort, Andrea Dellith, Jan Dellith, Anna Ignaszak, Adriana Vulpoi, Virginia Danciu, Benjamin Dietzek, Lucian Baia*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Abstract: Different morphologies of TiO2 photoelectrodes for dye sensitized solar cells were obtained by using TiO2 gels dried in normal conditions (TiO2 amb) and in CO2 atmosphere at high pressure (TiO2 press). After a subsequent calcination, the powders were processed as pastes and drop-casted on conductive glass in order to prepare photoanodes for dye sensitized solar cells. N719 commercial dye was used as sensitizer in all the experiments. The structure and morphology of the processed TiO2 materials were investigated via X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N2 adsorption/desorption measurements. The dye adsorption capacity of the photoanodes was tested using ultraviolet-visible absorption spectroscopy. The photovoltaic performances of the dye sensitized solar cells were investigated using current/voltage curves (I/V), open circuit photovoltage decay measurements and electrochemical impedance spectroscopy. The conversion efficiency (η) and short circuit density (Jsc) for TiO2 amb were 1.90 % and 5 mA/cm2 respectively, while the TiO2 press cell exhibited a 40 and 50 % increase in Jsc and η values respectively. This was correlated with increased dye loading capacities due to a broader distribution of pore size towards the mesopore region. Graphical Abstract: [InlineMediaObject not available: see fulltext.]

Original languageEnglish
Pages (from-to)693-703
Number of pages11
JournalJournal of Sol-Gel Science and Technology
Volume81
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

Keywords

  • Coatings
  • Drying procedures
  • Dye sensitized solar cells
  • Electrochemical techniques
  • Mesoporosity
  • TiO sol-gel

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