Synergistic effect between anatase and rutile TiO2 nanoparticles in dye-sensitized solar cells

Gonghu Li, Christiaan P. Richter, Rebecca L. Milot, Lawrence Cai, Charles A. Schmuttenmaer, Robert H. Crabtree, Gary W Brudvig, Victor S. Batista

Research output: Contribution to journalArticle

142 Citations (Scopus)

Abstract

A synergistic effect between anatase and rutile TiO2 is known, in which the addition of rutile can remarkably enhance the photocatalytic activity of anatase in the degradation of organic contaminants. In this study, mixed-phase TiO2 nanocomposites consisting of anatase and rutile nanoparticles (NPs) were prepared for use as photoanodes in dye-sensitized solar cells (DSSCs) and were characterized by using UV-vis spectroscopy, powder X-ray diffraction and scanning electron microscopy. The addition of 10–15% rutile significantly improved light harvesting and the overall solar conversion efficiency of anatase NPs in DSSCs. The underlying mechanism for the synergistic effect in DSSCs is now explored by using time-resolved terahertz spectroscopy. It is clearly demonstrated that photo-excited electrons injected into the rutile NPs can migrate to the conduction band of anatase NPs, enhancing the photocurrent and efficiency. Interfacial electron transfer from rutile to anatase, similar to that in heterogeneous photocatalysis, is proposed to account for the synergistic effect in DSSCs. Our results further suggest that the synergistic effect can be used to explain the beneficial effect of TiCl4 treatment on DSSC efficiency.

Original languageEnglish
Pages (from-to)10078-10085
Number of pages8
JournalJournal of the Chemical Society. Dalton Transactions
Issue number45
DOIs
Publication statusPublished - Nov 10 2009

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Nanoparticles
titanium dioxide
Dye-sensitized solar cells
Terahertz spectroscopy
Electrons
Photocatalysis
Conduction bands
Ultraviolet spectroscopy
Photocurrents
X ray powder diffraction
Conversion efficiency
Nanocomposites
Impurities
Degradation
Scanning electron microscopy

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Li, G., Richter, C. P., Milot, R. L., Cai, L., Schmuttenmaer, C. A., Crabtree, R. H., ... Batista, V. S. (2009). Synergistic effect between anatase and rutile TiO2 nanoparticles in dye-sensitized solar cells. Journal of the Chemical Society. Dalton Transactions, (45), 10078-10085. https://doi.org/10.1039/b908686b

Synergistic effect between anatase and rutile TiO2 nanoparticles in dye-sensitized solar cells. / Li, Gonghu; Richter, Christiaan P.; Milot, Rebecca L.; Cai, Lawrence; Schmuttenmaer, Charles A.; Crabtree, Robert H.; Brudvig, Gary W; Batista, Victor S.

In: Journal of the Chemical Society. Dalton Transactions, No. 45, 10.11.2009, p. 10078-10085.

Research output: Contribution to journalArticle

Li, Gonghu ; Richter, Christiaan P. ; Milot, Rebecca L. ; Cai, Lawrence ; Schmuttenmaer, Charles A. ; Crabtree, Robert H. ; Brudvig, Gary W ; Batista, Victor S. / Synergistic effect between anatase and rutile TiO2 nanoparticles in dye-sensitized solar cells. In: Journal of the Chemical Society. Dalton Transactions. 2009 ; No. 45. pp. 10078-10085.
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