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International Journal of Photoenergy
Volume 2013, Article ID 131984, 7 pages
Research Article

Effects of Anodic Buffer Layer in Top-Illuminated Organic Solar Cell with Silver Electrodes

Department of Photonics Engineering, Yuan Ze University, Taoyuan 32003, Taiwan

Received 19 July 2013; Accepted 16 September 2013

Academic Editor: Stefano Caramori

Copyright © 2013 Tien-Lung Chiu 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.


An efficient ITO-free top-illuminated organic photovoltaic (TOPV) based on small molecular planar heterojunction was achieved by spinning a buffer layer of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), on the anode. The PEDOT:PSS thin film separates the active layer far from the Ag anode to prevent metal quenching and redistributes the strong internal optical field toward dissociated interface. The thickness and morphology of this anodic buffer layer are the key factors in determining device performances. The uniform buffer layer contributes a large short-circuit current and open-circuit voltage, benefiting the final power conversion efficiency (PCE). The TOPV device with an optimal PEDOT:PSS thickness of about 30 nm on anode exhibits the maximum PCE of 1.49%. It appreciates a 1.37-fold enhancement in PCE over that of TOPV device without buffer layer.