Efficient dye regeneration in solid-state dye-sensitized solar cells fabricated with melt processed hole conductors

Mindaugas Juozapavicius, Brian C. O'Regan, Assaf Y. Anderson, Juozas V. Grazulevicius, Viktorija Mimaite

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

A new method for melting hole transporting materials (HTM) into mesoporous TiO2 electrodes to obtain solid-state dye-sensitized solar cells (DSSC) is reported. Internal coverage is determined from the efficiency of hole conductor oxidation by photo-oxidized dyes (dye regeneration), measured using transient absorption spectroscopy. High efficiency regeneration indicates complete coverage of the electrode internal surface. A high work function hole conductor (>5.2 eV) was found to give shorter regeneration lifetimes (<1 μs) and better regeneration efficiencies (>90%) than expected. Cell photocurrents were low, but improved after iodine vapor doping of the hole conductor. Counter intuitively, doping also reduced the recombination rate constant 7-fold. A solid state solar cell with power conversion efficiency of 0.075% at 1 sun is reported.

Original languageEnglish
Pages (from-to)23-30
Number of pages8
JournalOrganic Electronics
Volume13
Issue number1
DOIs
StatePublished - Jan 2012
Externally publishedYes

Bibliographical note

Funding Information:
Xiaoe Li is greatly thanked for assistance. M.J. would like to acknowledge EPSRC for a Plastic Electronic Materials Doctoral Training Center studentship. Financial support by the Research Council of Lithuania (Project No. MIP-64/2010) is gratefully acknowledged.

Keywords

  • Dye-sensitized solar cell
  • Melt-processable
  • Organic hole transporting material
  • Transient absorption spectroscopy

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