Porphyrin dyes with high injection and low recombination for highly efficient mesoscopic dye-sensitized solar cells

Eva M. Barea, Victoria Gónzalez-Pedro, Teresa Ripollés-Sanchis, Hui Ping Wu, Lu Lin Li, Chen Yu Yeh, Wei-Guang Diau, Juan Bisquert

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

The photovoltaic performance and charge recombination characteristics of porphyrin-based dye-sensitized solar cell (DSC) devices have been investigated using the impedance spectroscopy (IS) technique. The IS results provide key information related to the device performance for a highly efficient porphyrin dye (YD2), a reference porphyrin dye (YD0), and a commercial ruthenium dye (N719). The DSC devices constructed using YD2 and N719 dyes reach similar internal power conversion efficiencies (7.41% vs 7.54%) due to the higher injection of the YD2 dye that is compromised by a lower photovoltage. In addition, both YD2 and N719 dyes exhibit the same charge-transfer resistance, indicating that the recombination rates of both dyes are very similar. The diarylamino group plays a key role to repel the triiodide ions from the titania surface so that the charge recombination of YD2 is less significant compared with that of YD0.

Original languageEnglish
Pages (from-to)10898-10902
Number of pages5
JournalJournal of Physical Chemistry C
Volume115
Issue number21
DOIs
StatePublished - 2 Jun 2011

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