Electron transport and recombination in solid-state dye solar cell with spiro-OMeTAD as hole conductor

Francisco Fabregat-Santiago, Juan Bisquert, Le Cevey, Peter Chen, Mingkui Wang, Shaik M. Zakeeruddin, Michael Grätzel

Research output: Contribution to journalArticlepeer-review

360 Citations (Scopus)

Abstract

We show that electron transport mechanisms in TiO2 solid-state dye-sensitized solar cells (SDSCs) with spiro-OMeTAD as hole conductor are similar to those of high-performance DSCs with liquid electrolytes and ionic liquids. Impedance spectroscopy provides the parameters for transport and recombination at different conditions of steady state in the dark. The recombination rate is much higher in the solid solar cell, this being a main limiting step to obtain high-efficiency SDSCs. Thus, the expected gain in photovoltage, due to a lower hole Fermi level, is prevented by recombination losses. Under low potentials the transport is limited by the electron transport in the TiO2, but at high potentials spiro-OMeTAD transport resistance reduces the fill factor and hence the efficiency on high-current devices.

Original languageEnglish
Pages (from-to)558-562
Number of pages5
JournalJournal of the American Chemical Society
Volume131
Issue number2
DOIs
Publication statusPublished - 2009 Jan 21

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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