Optimizing the photovoltaic performance of thiocyanate-free ruthenium photosensitizers by structural modification of C^N cyclometalating ligand in dye-sensitized solar cells

Chi Ho Siu, Cheuk Lam HO*, Jian He, Tao Chen, Poulomi Majumda, Jianzhang Zhao, Hua Li, Wai Yeung WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Five new thiocyanate-free ruthenium(II) complexes with different electron-donating functionalized cyclometalating ligands C^N were synthesized, characterized and applied as photosensitizers in dye-sensitized solar cells (DSSCs). Their photophysical, electrochemical, thermal and photovoltaic properties have been investigated and density functional theory (DFT) calculations have been carried out on these dyes. These dyes exhibit good thermal stability with the onset decomposition temperature at 5% weight-loss (Td) of around 330 °C. The DSSC device using the Ru(II) dye with the 9-tolylcarbazole chromophore exhibited the highest power conversion efficiency (η) up to 3.39%, with a short-circuit photocurrent density (Jsc) of 8.06 mA cm-2, an open-circuit photovoltage (Voc) of 0.62 V and a high fill factor (ff) of 0.68 under illumination of an AM 1.5 solar cell simulator.

Original languageEnglish
Pages (from-to)71-79
Number of pages9
JournalPolyhedron
Volume82
DOIs
Publication statusPublished - 4 Nov 2014

Scopus Subject Areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

User-Defined Keywords

  • Dye-sensitized solar cells
  • Energy conversion
  • Photovoltaics
  • Ruthenium complexes
  • Synthesis

Fingerprint

Dive into the research topics of 'Optimizing the photovoltaic performance of thiocyanate-free ruthenium photosensitizers by structural modification of C^N cyclometalating ligand in dye-sensitized solar cells'. Together they form a unique fingerprint.

Cite this