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International Journal of Photoenergy
Volume 2012 (2012), Article ID 897595, 5 pages
http://dx.doi.org/10.1155/2012/897595
Research Article

Airbrush Spray Coating of Amorphous Titanium Dioxide for Inverted Polymer Solar Cells

Department of Electronic Engineering, (Centre for Hybrid and Organic Solar Energy), CHOSE, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy

Received 25 September 2012; Revised 17 October 2012; Accepted 18 October 2012

Academic Editor: Vincenzo Augugliaro

Copyright © 2012 Luca La Notte 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

One of the main topics of organic photovoltaics manufacturing is the need for simple, low cost, and large area compatible techniques. Solution-based processes are the best candidates to achieve this aim. Among these, airbrush spray coating has successfully applied to deposit both active and PEDOT layers of bulk-heterojunction solar cells. However, this technique is not yet sufficiently studied for interfacial layers (electron and hole transporting layers or optical spacers). In this paper, we show that amorphous titanium dioxide ( ) films, obtained with an airbrush from a solution of titanium (IV) isopropoxide diluted in isopropanol, are successfully deposited on glass and PET substrates. Good surface covering results from the coalescence of droplets after optimizing the spray coating system. Simple inverted polymer solar cells are fabricated using as electron transporting layer obtaining encouraging electrical performances ( % on glass/FTO and 0.7% on PET/ITO substrates).