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International Journal of Photoenergy
Volume 2014 (2014), Article ID 784724, 6 pages
http://dx.doi.org/10.1155/2014/784724
Research Article

Stability of High Band Gap P3HT : PCBM Organic Solar Cells Using TiOx Interfacial Layer

1Applied Research Center, 12050 Jefferson Avenue, Newport News, VA 23606, USA
2Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23529, USA
3Physics Department, Faculty of Science, Damanhour University, Damanhour 22111, Egypt
4Department of Molecular Biology and Chemistry, Christopher Newport University, Newport News, VA 23606, USA

Received 31 May 2013; Revised 21 November 2013; Accepted 22 November 2013; Published 28 January 2014

Academic Editor: Xie Quan

Copyright © 2014 Kurniawan Fu 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

We fabricated a poly[3-hexylthiophene] (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) organic photovoltaic cells (OPCs) using TiOx interfacial layer. We performed optimization processes for P3HT : PC61BM with the TiOx layer. We found that a solution based TiOx layer coated at a spin speed of 3000 rpm improved the photon absorption of the active layer. An optimized TiOx layer was also used as the interfacial layer to investigate the stability of P3HT : PC61BM OPC. After 70 days of storage, we observed that the short-circuit current density () dropped by 16.2%, fill factor (FF) dropped by 10.6%, and power conversion efficiency (PCE) dropped approximately by 25%, while the open-circuit voltage () remained relatively stable. We found that a solution based TiOx layer synthesized using a sol-gel chemistry method was very effective in protecting the active layer from degradation.