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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 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

Bibliographical note

Funding Information:
The authors would like to acknowledge the support provided by King Abdulaziz City for Science and Technology (KACST) through the Science & Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM) for funding this work through project no. 11-ENE1635-04 as part of the National Science, Technology and Innovation Plan. KFUPM is also acknowledged for supporting this research. The authors would like to acknowledge the Center of Research Excellence for Renewable Energy at KFUPM.

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.


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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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