Performance enhancement of dye-sensitized solar cells via co-sensitization of ruthenium (II) based N749 dye and organic sensitizer RK1

M. Younas, K. Harrabi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


The aim of the reported study is to enhance the photovoltaic performance of a dye-sensitized solar cells (DSSCs) using co-sensitization approach and investigate how the concentration of an organic co-sensitizer influence the overall efficiency of the fabricated DSSCs. The overall efficiency of the fabricated DSSC with co-sensitization approach using a ruthenium (II) based dye, N749, and an organic sensitizer, RK1, is 8.15%. The solar cells were evaluated using UV–Vis spectroscopy, electrochemical impedance spectroscopy (EIS), incident photon to electron conversion efficiency (IPCE), and current-voltage (I-V) characteristics. The concentration of the organic co-sensitizer has a strong effect on the performance of the DSSC. An optimized solar cell fabricated with a dye solution of 0.2 mM RK1 and 0.3 mM N749 yielded a Jsc (mA/cm2) = 19.45, Voc (mV) = 688, FF (%) = 61 and power conversion efficiency (PCE) of η(%) = 8.15 under standard (AM1.5 G) 1 sun illumination (100 mW/cm2). The efficiency of co-sensitized DSSCs is far better than the efficiency of fabricated solar cells sensitized with individual dyes [N749 (η = 4.94%) and RK1 (η = 5.76%)]. The efficiency enhancement is due to the lower rate of recombination of electrons and holes, decreased I/I3 competitive absorption, and lower aggregation of the dyes resulting from the synergistic action in the co-sensitized photovoltaic cells.

Original languageEnglish
Pages (from-to)260-266
Number of pages7
JournalSolar Energy
StatePublished - Jun 2020

Bibliographical note

Funding Information:
M.Y and K.H would like to thank the National Science, Technology and Innovation Program of KACST for funding this research under Project No. 12-ENE2379-04 . They also acknowledge support from KFUPM and Research Institute.

Publisher Copyright:
© 2020


  • Co-sensitization
  • DSSC
  • Efficiency
  • Organic Sensitizer (RK1)
  • Photovoltaic
  • Ruthenium (II) based dye (N749)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (all)


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