Improving the efficiency of dye sensitized solar cells by TiO2-graphene nanocomposite photoanode

Umer Mehmood, Shakeel Ahmed, Ibnelwaleed A. Hussein, Khalil Harrabi

Research output: Contribution to journalJournal articlepeer-review

23 Scopus citations


Nanocomposite photoanodes were prepared by addition of graphene (GR) micro-platelets to TiO2 nanoparticulate paste. TiO2/graphene based DSSCs were fabricated using Z907 photosensitizer. Transmission electron microscope was used to confirm the presence of graphene in composite films after heating at 450 °C for 30 min. UV-visible absorption spectroscopy, photocurrent-voltage characteristics and electrochemical impedance spectroscopic measurements were conducted to characterize the DSSCs. The results show that the photo conversion efficiency is highly dependent on the concentration of graphene in the photoanode. Under an optimal conditions, solar cell based on graphene/TiO2 shows power conversion efficiency (PCE) of 4.03%, which is about 26% greater than the cell based on pristine TiO2 electrode (3.20%). A density functional theory was used to compute the band gap of TiO2 and graphene-TiO2 nano clusters.

Original languageEnglish
Pages (from-to)34-42
Number of pages9
JournalPhotonics and Nanostructures - Fundamentals and Applications
StatePublished - 1 Aug 2015


  • Dye sensitized solar cell
  • Graphene
  • Nanocomposite photoanodes
  • Power conversion efficiency
  • Titania


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