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Journal of Nanomaterials
Volume 2012 (2012), Article ID 103417, 6 pages
http://dx.doi.org/10.1155/2012/103417
Research Article

Annealing Effect on Photovoltaic Performance of CdSe Quantum-Dots-Sensitized TiO2 Nanorod Solar Cells

1School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
2School of Information Science and Engineering, Shandong University, Jinan 250100, China
3Department of Physics, Portland State University, P.O. Box 751, Portland, OR 97207-0751, USA

Received 4 August 2012; Revised 22 October 2012; Accepted 24 October 2012

Academic Editor: Jian Wei

Copyright © 2012 Yitan Li 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

Large area rutile TiO2 nanorod arrays were grown on F:SnO2 (FTO) conductive glass using a hydrothermal method at low temperature. CdSe quantum dots (QDs) were deposited onto single-crystalline TiO2 nanorod arrays by a chemical bath deposition (CBD) method to make a photoelectrode. The solar cell was assembled using a CdSe-TiO2 nanostructure as the photoanode and polysulfide solution as the electrolyte. The annealing effect on optical and photovoltaic properties of CdSe quantum-dots-sensitized TiO2 nanorod solar cells was studied systematically. A significant change of the morphology and a regular red shift of band gap of CdSe nanoparticles were observed after annealing treatment. At the same time, an improved photovoltaic performance was obtained for quantum-dots-sensitized solar cell using the annealed CdSe-TiO2 nanostructure electrode. The power conversion efficiency improved from 0.59% to 1.45% as a consequence of the annealing effect. This improvement can be explained by considering the changes in the morphology, the crystalline quality, and the optical properties caused by annealing treatment.