Impact of High Charge-Collection Efficiencies and Dark Energy-Loss Processes on Transport, Recombination, and Photovoltaic Properties of Dye-Sensitized Solar Cells

Kai Zhu, Song Rim Jang, Arthur J. Frank

Research output: Contribution to journalArticlepeer-review

83 Scopus Citations

Abstract

We report on the relationships between the energy-loss processes in the dark, charge-collection efficiency and photocurrent density-voltage characteristics of dye-sensitized solar cells (DSSCs). The charge-collection efficiencies (νcc) of the DSSCs with different electrolytes were close to 100%. Despite the high νcc values, the DSSCs showed significant loss of photocurrent density and power density resulting from dark processes associated with the exchange current density J0 at the TiO2/electrolyte interface, series resistance of the cells, and diode ideality factor. Even in DSSCs with high νcc values, making recombination slower and transport faster in the dark would reduce these losses. The opposing effects of J0 and light absorption properties of DSSCs were found to determine the optimum film thickness (Lopt) for the highest output power density. These effects also explain why Lopt is generally much less than the electron diffusion length.

Original languageAmerican English
Pages (from-to)1070-1076
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume2
Issue number9
DOIs
StatePublished - 5 May 2011

NREL Publication Number

  • NREL/JA-5200-51328

Keywords

  • charge transport efficiency
  • dye-sensitized solar cells
  • photocurrent density

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