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Journal of Nanomaterials
Volume 2012 (2012), Article ID 498286, 6 pages
http://dx.doi.org/10.1155/2012/498286
Research Article

Photoacoustic Study of CdS QDs for Application in Quantum-Dot-Sensitized Solar Cells

1Department of Physics, Taif University, Taif 21974, Saudi Arabia
2Department of Mathematical and Physical Engineering, Benha University, Benha 13511, Egypt
3Physics Department, Ain Shams University, Cairo 11566, Egypt

Received 11 April 2012; Accepted 8 September 2012

Academic Editor: Christian Brosseau

Copyright © 2012 S. Abdallah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The optical properties and photovoltaic characterization of CdS quantum dots sensitized solar cells (QDSSCs) were studied. CdS QDs were prepared by the chemical solution deposition (CD) technique. Photoacoustic spectroscopy (PA) was employed to study the optical properties of the prepared samples. The sizes of the CdS QDs were estimated from transmission electron microscope (TEM) micrographs gives radii ranged from 1.57 to 1.92 nm. The current density-voltage (J-V) characteristic curves of the assembled QDSSCs were measured. Fluorine doped Tin Oxide (FTO) substrates were coated with 20 nm-diameter TiO2 nanoparticles (NPs). Presynthesized colloidal CdS quantum dots of different particles size were deposited on the TiO2-coated substrates using direct adsorption (DA) method. The FTO counter electrodes were coated with platinum, while the electroelectrolyte containing redox species was sandwiched between the two electrodes. The short current density ( ) and efficiency (η) increases as the particle size increases. The values of increases linearly with increasing the intensities of the sun light which indicates the greater sensitivity of the assembled cells.