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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/14052

Title: Efficient inverted polymer solar cells employing favourable molecular orientation
Authors: Vohra, Varun
Kawashima, Kazuaki
Kakara, Takeshi
Koganezawa, Tomoyuki
Osaka, Itaru
Takimiya, Kazuo
Murata, Hideyuki
Keywords: Efficient inverted polymer solar cells
single-junction inverted cells
Issue Date: 2015-05-25
Publisher: Nature
Magazine name: Nature Photonics
Volume: 9
Start page: 403
End page: 408
DOI: 10.1038/nphoton.2015.84
Abstract: The improvement in the power conversion efficiency is a critical issue for polymer-based bulk-heterojunction solar cells (PSCs). Here, we show that high efficiencies of ~10% can be obtained by using a crystalline polymer, PNTz4T, in single-junction inverted cells with the thick active layer measuring ca. 300 nm. The improved performance is likely due to the large population of the polymer crystallites with the face-on orientation and the “favourable” distribution of edge-on and face-on crystallites along the film thickness, as revealed by in-depth studies of the blend films using grazing incidence wide angle X-ray diffraction, which results in the reduction of charge recombination and the efficient charge transport. These results underscore the great promise of PSCs, and raise hopes of achieving even higher efficiencies by materials development and control of molecular ordering.
Rights: Copyright (C) 2015 Nature. Varun Vohra, Kazuaki Kawashima, Takeshi Kakara, Tomoyuki Koganezawa, Itaru Osaka, Kazuo Takimiya, and Hideyuki Murata, Nature Photonics, 9, 2015, 403-408. http://dx.doi.org/10.1038/nphoton.2015.84
URI: http://hdl.handle.net/10119/14052
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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