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International Journal of Photoenergy
Volume 2010, Article ID 698718, 5 pages
http://dx.doi.org/10.1155/2010/698718
Research Article

Surface Plasmon-Induced Band Gap in the Photocurrent Response of Organic Solar Cells

1Department of Physics, Royal Military College of Canada, P.O. Box 17000, STN Forces, Kingston, ON, Canada K7K 7B4
2Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13566-590 São Carlos, SP, Brazil

Received 14 September 2010; Revised 12 November 2010; Accepted 8 December 2010

Academic Editor: Mark van der Auweraer

Copyright © 2010 Ribal Georges Sabat 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

A 260 nm layer of organic bulk heterojunction blend of the polymer poly(3-hexylthiophene) (P3HT) and the fullerene [6,6]-phenyl C61-butyric (PCBM) was spin-coated in between aluminum and gold electrodes, respectively, on top of a laser inscribed azo polymer surface-relief diffraction grating. Angle-dependent surface plasmons (SPs) with a large band gap were observed in the normalized photocurrent by the P3HT-PCBM layer as a function of wavelength. The SP-induced photocurrents were also investigated as a function of the grating depth and spacing.