Hybrid photoanodes for dye-sensitized solar cells (DSSCs) were prepared by simple addition of graphene (GR) microplatelets to TiO2 nanoparticulate paste. Transmission electron microscopy was used to confirm the presence of GR in composite films after heating at 450 °C for 30 min. TiO2/GR-based DSSCs were fabricated using an N749 photosensitizer. The UV-Visible absorption spectroscopy, photocurrent-voltage (I-V) characteristic, and electrochemical impedance spectroscopy measurements were carried out to characterize the cells. The results indicate that the GR/TiO2 photoanode improves the performance of the solar cell. This is because the GR/titania electrode accelerates electronic transportation and suppresses the charge recombination. Under optimal conditions, the solar cell based on GR/TiO2 shows power conversion efficiency (PCE) of 4.1%, which is about 30% greater than the cell based on the pristine TiO2 electrode (3.16%). The objective of this study is to develop a fast, cheap, and an effective means to increase the PCE of DSSCs. Density functional theory was used to calculate the bandgap of TiO2 and graphnene-TiO2.
Bibliographical notePublisher Copyright:
© 2011-2012 IEEE.
- Dye-sensitized solar cell (DSSC)
- graphene (GR)
- nanocomposite photoanodes
- power conversion efficiency (PCE)
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering