Two-Dimensional Time-Dependent Numerical Modeling of Edge Effects in Dye Solar Cells

K. Miettunen, J. Halme, A.-M. Visuri, P. Lund

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

A two-dimensional transient model of dye solar cells (DSC) describing the electrochemical reactions in the cell has been prepared. The model includes the relevant components of DSCs: the photoelectrode, the electrolyte, and the counter electrode. The solved variables are potential and the concentrations of the different ion species, which can be used to determine, e.g., the current voltage characteristics of the cell. The largest benefit of this model is its 2D features which enable the study of lateral inhomogeneity. Using the model, a new phenomenon was described: lateral current density distribution caused by a small difference in the size between photoelectrode and counter electrode, typical of laboratory test cells, causes tri-iodide to move from the edge region to the active area of the cell. This process takes a relatively long time (8 min) and can be important for performance characterization and design of DSCs.

Original languageEnglish
Pages (from-to)7019-7031
Number of pages13
JournalJournal of Physical Chemistry C
Volume115
Issue number14
DOIs
Publication statusPublished - 14 Apr 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • BACK-REACTION
  • PHOTOELECTROCHEMICAL CELLS
  • CONVERSION EFFICIENCY
  • ELECTRON INJECTION
  • DIFFUSION LENGTH
  • MASS-TRANSPORT
  • RECOMBINATION
  • PERFORMANCE
  • SUBSTRATE
  • LAYER

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