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Mobility-controlled performance of thick solar cells based on fluorinated copolymers

  • Developing novel materials and device architectures to further enhance the efficiency of polymer solar cells requires a fundamental understanding of the impact of chemical structures on photovoltaic properties. Given that device characteristics depend on many parameters, deriving structureproperty relationships has been very challenging. Here we report that a single parameter, hole mobility, determines the fill factor of several hundred nanometer thick bulk heterojunction photovoltaic devices based on a series of copolymers with varying amount of fluorine substitution. We attribute the steady increase of hole mobility with fluorine content to changes in polymer molecular ordering. Importantly, all other parameters, including the efficiency of free charge generation and the coefficient of nongeminate recombination, are nearly identical. Our work emphasizes the need to achieve high mobility in combination with strongly suppressed charge recombination for the thick devices required by mass production technologies.

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Author:Wentao Li, Steve Abrecht, Liqiang Yang, Steffen RolandORCiDGND, John R. Tumbleston, Terry McAfee, Liang Yan, Mary Allison Kelly, Harald W. Ade, Dieter NeherORCiDGND, Wei You
ISSN:0002-7863 (print)
Pubmed Id:http://www.ncbi.nlm.nih.gov/pubmed?term=25341026
Parent Title (English):Journal of the American Chemical Society
Publisher:American Chemical Society
Place of publication:Washington
Document Type:Article
Year of first Publication:2014
Year of Completion:2014
Release Date:2017/03/27
First Page:15566
Last Page:15576
Funder:Office of Naval Research [N000141110235, N000141410221]; National Science Foundation CAREER award [DMR-0954280]; NSF SOLAR Grant [DMR-1125803]; DOE, OS, BES, MSE [DE-FG02-98ER45737]; BMBF within PVcomB [FKZ 03IS2151D]; DFG [SPP 1355]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert