Thiocyanate-Free Ruthenium(II) Sensitizers for Dye-Sensitized Solar Cells Based on the Cobalt Redox Couple

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Kuan-Lin Wu
  • John N. Clifford
  • Sheng-Wei Wang
  • Yella Aswani
  • Emilio Palomares
  • Maria Grazia Lobello
  • Edoardo Mosconi
  • Filippo De Angelis
  • Wan-Ping Ku
  • Mohammad K. Nazeeruddin
  • Michael Grätzel

Detail(s)

Original languageEnglish
Pages (from-to)2930-2938
Journal / PublicationChemSusChem
Volume7
Issue number10
Online published21 Aug 2014
Publication statusPublished - Oct 2014
Externally publishedYes

Abstract

Two thiocyanate-free ruthenium(II) sensitizers, TFRS-41 and TFRS-42, with distinctive dialkoxyphenyl thienyl substituents were successfully prepared and tested for potential applications in making dye-sensitized solar cells (DSCs). Subsequent device fabrication was conducted by using a [Co(bpy)3]2+/3+-based (bpy=2,2'-bipyridine) electrolyte, for which the best performance data, namely, JSC=13.11 mAcm-2, VOC=862 mV, fill factor=0.771, and η=8.71%, were recorded for the sensitizer TFRS-42 with a 2,6-dialkoxyphenyl substituent under AM 1.5G irradiation. The markedly higher Voc value was confirmed by the longer electron lifetime revealed in transient photovoltage (TPV) measurements versus the TFRS-1 sensitizer. In addition, DFT calculation and detailed first-principles computational analysis were conducted to provide a rationale for the observed trends in their photovoltaic performances and electron lifetimes, with reference to different performances exhibited by three thiocyanate-free sensitizers, TFRS-1, TFRS-41 and TFRS-42, versus Z907 reference. Through the proper control of peripheral substituents, the thiocyanate-free ruthenium(II)-based DSC sensitizers can positively influence the performances of DSCs, with better light-harvesting capability and suppressed charge recombination, for DSC cells fabricated by using a [Co(bpy)3]2+/3+-based electrolyte.

Research Area(s)

  • cobalt, dyes/pigments, ruthenium, sensitizers, solar cells

Citation Format(s)

Thiocyanate-Free Ruthenium(II) Sensitizers for Dye-Sensitized Solar Cells Based on the Cobalt Redox Couple. / Wu, Kuan-Lin; Clifford, John N.; Wang, Sheng-Wei; Aswani, Yella; Palomares, Emilio; Lobello, Maria Grazia; Mosconi, Edoardo; De Angelis, Filippo; Ku, Wan-Ping; Chi, Yun; Nazeeruddin, Mohammad K.; Grätzel, Michael.

In: ChemSusChem, Vol. 7, No. 10, 10.2014, p. 2930-2938.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review