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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/12072

Title: Formation of vertical concentration gradients in poly(3-hexylthiophene-2,5-diyl): Phenyl-C_<61>-butyric acid methyl ester-graded bilayer solar cells
Authors: Vohra, Varun
Higashimine, Koichi
Tsuzaki, Shogo
Ohdaira, Keisuke
Murata, Hideyuki
Keywords: Organic solar cells
Issue Date: 2013-06-18
Publisher: Elsevier
Magazine name: Thin Solid Films
Volume: 554
Start page: 41
End page: 45
DOI: 10.1016/j.tsf.2013.05.171
Abstract: In the present work, we demonstrate that graded bilayer solar cells provide a very interesting alternative to the bulk heterojunction active layers commonly used in organic photovoltaic cells. One of the main advantages of this type of active layers is the possibility to optimize independently both donor and acceptor layers. Using various process methods, we obtain active layers that demonstrate a donor-acceptor vertical concentration gradient. These devices exhibit not only a high fill factor but also a remarkable increase in open-circuit voltage (V_<oc>). In order to understand the influence of the film morphology over the device parameters, we provide a complete study using energy-dispersive X-Ray spectroscopy elemental mapping of the device cross-sections which shows evidence that ideal donor-acceptor concentration gradient are required to obtain high fill factors. Furthermore, we use a simple equivalent electrical model to extrapolate device parameters such as reverse saturation current for a clearer understanding of the origin of the V_<oc> increase.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. Varun Vohra, Koichi Higashimine, Shogo Tsuzaki, Keisuke Ohdaira, Hideyuki Murata, Thin Solid Films, 554, 2013, 41-45, http://dx.doi.org/10.1016/j.tsf.2013.05.171
URI: http://hdl.handle.net/10119/12072
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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