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Journal of Nanomaterials
Volume 2014, Article ID 964548, 7 pages
http://dx.doi.org/10.1155/2014/964548
Research Article

Role of Vanadium Pentoxide Hole-Extracting Nanolayer in Rubrene/ -Based Small Molecule Organic Solar Cells

Zhen Zhan,1,2 Jing Cao,1,2 Weiguang Xie,1,2 Lintao Hou,1,2,3 Qin Ye,1,2 and Pengyi Liu1,2,3

1Department of Physics, Jinan University, Guangzhou 510632, China
2Siyuan Lab, Jinan University, Guangzhou 510632, China
3State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510632, China

Received 2 November 2013; Accepted 13 January 2014; Published 27 February 2014

Academic Editor: Yu-Lun Chueh

Copyright © 2014 Zhen Zhan 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

Vanadium pentoxide was inserted between the donor layer and the anode as a hole-extracting nanolayer. Compared with devices without a hole-extracting layer, short-circuit current density ( ), open-circuit voltage ( ), fill factor (FF), and power conversion efficiency (PCE) of rubrene/C70-based heterojunction solar cells with 3 nm V2O5 nanolayer are enhanced by 99%, 73%, 20%, and 310%, respectively. We found that V2O5 interlayer can effectively suppress the contact resistance and increase the hole transport capability. The dependence of the device performance on V2O5 layer thickness as well as fill factor on exciton dissociation and charge transport was also investigated in detail.