Hybrid TiO<inf>2</inf>-multiwall carbon nanotube (MWCNTs) photoanodes for efficient dye sensitized solar cells (DSSCs)

Umer Mehmood, Ibnelwaleed A. Hussein, Khalil Harrabi, M. B. Mekki, Shakeel Ahmed, Nouar Tabet

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Dye sensitized solar cells (DSSCs) based on TiO<inf>2</inf>/MWCNTs composite with varying concentrations of CNTs (0, 0.03. 0.06, 0.09, 0.15, and 0.21 wt%), fabricated using N3 dye as a sensitizer. Transmission electron microscopy was used to confirm the dispersion of carbon nanotubes in TiO<inf>2</inf>. 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 CNTs in the photoanode. A solar cell based on a photoanode containing 0.03 wt% MWCNTs has a power conversion efficiency which is about 30% greater than that of the unmodified photoanode. A quantum modeling technique based on the density functional theory was used to investigate the thermodynamic aspects of the charge transport processes in DSSCs. Simulation results support the experimental data.

Original languageEnglish
Pages (from-to)174-179
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume140
DOIs
Publication statusPublished - 1 Sep 2015

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Keywords

  • Density functional theory
  • DSSC
  • Hybrid photoanodes
  • MWCNT

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films

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