Effect of an adsorbent on recombination and band-edge movement in dye-sensitized TiO2 solar cells: Evidence for surface passivation

Nikos Kopidakis*, Nathan R. Neale, Arthur J. Frank

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

247 Citations (Scopus)

Abstract

The mechanism by which the adsorbent guanidinium affects the open-circuit photovoltage of dye-sensitized TiO2 nanocrystalline solar cells was investigated. The influence of the guanidinium cation on the rate of recombination and band-edge movement was measured by transient photovoltage. When guanidinium is present in the electrolyte recombination becomes slower by a factor of about 20. At the same time, the adsorbent causes the band edges to move downward, toward positive electrochemical potentials, by 100 mV. The collective effect of both a downward shift of the band edges and slower recombination, owing to the presence of guanidinium, results in an overall improvement in the open-circuit photovoltage.

Original languageEnglish
Pages (from-to)12485-12489
Number of pages5
JournalJournal of Physical Chemistry B
Volume110
Issue number25
DOIs
Publication statusPublished - 29 Jun 2006
Externally publishedYes

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