Effect of Cations on the Open-Circuit Photovoltage and the Charge-Injection Efficiency of Dye-Sensitized Nanocrystalline Rutile TiO2 Films

N. G. Park, S. H. Chang, J. Van de Lagemaat, K. J. Kim, A. J. Frank

Research output: Contribution to journalArticlepeer-review

67 Scopus Citations

Abstract

Dye-sensitized nanocrystalline rutile TiO2 solar cells were prepared, and the influence of Li+ and 1,2-dimethyl-3-hexyl imidazolium ions in the electrolyte on the photovoltaic properties was compared. The electrolyte containing Li+ ions produced a lower open-circuit photovoltage than the electrolyte with 1,2-dimethyl-3-hexyl imidazolium ions, suggesting that the adsorption of Li+ ions to the rutile TiO2 surface causes a shift in the band edges toward more positive potentials. At the same time, both the short-circuit photocurrent and the maximum value of the incident-photon-current conversion efficiency (IPCE) of the electrolyte containing Li+ ions were relatively higher. Data analysis suggests that presence of adsorbed Li+ ions improves via the phenomenon of band-edge movement the charge-injection efficiency by altering both the energy and number of excited state levels of the dye that participate in electron injection.

Original languageAmerican English
Pages (from-to)985-988
Number of pages4
JournalBulletin of the Korean Chemical Society
Volume21
Issue number10
StatePublished - 20 Oct 2000
Externally publishedYes

NREL Publication Number

  • NREL/JA-590-30037

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