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Journal of Nanotechnology
Volume 2012, Article ID 513457, 5 pages
http://dx.doi.org/10.1155/2012/513457
Research Article

Thickness Effect on F8T2/C60 Bilayer Photovoltaic Devices

Grupo de Dispositivos Nanoestruturados, Departamento de Física, Universidade Federal do Paraná, 8153-990 Curitiba, PR, Brazil

Received 15 July 2011; Accepted 3 September 2011

Academic Editor: Kun'ichi Miyazawa

Copyright © 2012 Natasha A. D. Yamamoto 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

Copolymers based on fluorene-thiophene units have presented promising efficiencies in photovoltaic devices applications. They present good transport properties mainly after thermal treatment of the polymer films. Here, we investigate the properties of bilayer devices formed by the heterojunction of the polymer F8T2 with variable thickness and the fullerene. The series resistance of the equivalent circuit associated with the device increases as the polymer film gets thicker. The current-voltage characteristics of the bilayer devices follow the Mott-Gurney law of SCLC. For the best performing device we measured 2.1% of power conversion efficiency.