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International Journal of Photoenergy
Volume 2012 (2012), Article ID 637839, 8 pages
http://dx.doi.org/10.1155/2012/637839
Research Article

Acid Treatment of Titania Pastes to Create Scattering Layers in Dye-Sensitized Solar Cells

SPECIFIC, College of Engineering, Baglan Bay Innovation and Knowledge Centre, Swansea University, Central Avenue, Baglan SA12 7AX, UK

Received 3 August 2012; Accepted 28 September 2012

Academic Editor: Leonardo Palmisano

Copyright © 2012 Trystan Watson 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

In dye-sensitized solar cells (DSC) scattering layers are used to increase the path length of light incident on the TiO2 film. This is typically achieved by the deposition of an additional TiO2 layer on top of an existing transparent film and designed to trap light. In this work we show that a simple acid pretreatment can lead to the formation of a scattering “skin” on the surface of a single TiO2 film performing a similar function to a scattering layer without any additional depositions. This is important in increasing manufacturing throughput for DSCs as further TiO2 depositions require additional materials and heat treatment. The pretreatment leads to self-assembly of a scattering layer of TiO2 which covers the surface on short-term immersion (<30 min) and penetrates the bulk layer upon longer immersion. The method has been shown to increase the efficiency of the device by 20%.