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Photocurrent enhancement from diketopyrrolopyrrole polymer solar cells through alkyl-chain branching point manipulation.

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Title: Photocurrent enhancement from diketopyrrolopyrrole polymer solar cells through alkyl-chain branching point manipulation.
Authors: Meager, I
Ashraf, RS
Mollinger, S
Schroeder, BC
Bronstein, H
Beatrup, D
Vezie, MS
Kirchartz, T
Salleo, A
Nelson, J
McCulloch, I
Item Type: Journal Article
Abstract: Systematically moving the alkyl-chain branching position away from the polymer backbone afforded two new thieno[3,2-b]thiophene-diketopyrrolopyrrole (DPPTT-T) polymers. When used as donor materials in polymer:fullerene solar cells, efficiencies exceeding 7% were achieved without the use of processing additives. The effect of the position of the alkyl-chain branching point on the thin-film morphology was investigated using X-ray scattering techniques and the effects on the photovoltaic and charge-transport properties were also studied. For both solar cell and transistor devices, moving the branching point further from the backbone was beneficial. This is the first time that this effect has been shown to improve solar cell performance. Strong evidence is presented for changes in microstructure across the series, which is most likely the cause for the photocurrent enhancement. © 2013 American Chemical Society.
Issue Date: 7-Aug-2013
URI: http://hdl.handle.net/10044/1/14661
DOI: http://dx.doi.org/10.1021/ja406934j
Start Page: 11537
End Page: 11540
Journal / Book Title: J Am Chem Soc
Volume: 135
Issue: 31
Copyright Statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in the Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/ja406934j
Conference Place: United States
Appears in Collections:Chemistry
Experimental Solid State
Centre for Environmental Policy



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