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Quantifying charge extraction in organic solar cells: The case of fluorinated PCPDTBT

  • We introduce a new and simple method to quantify the effective extraction mobility in organic solar cells at low electric fields and charge carrier densities comparable to operation conditions under one sun illumination. By comparing steady-state carrier densities at constant illumination intensity and under open-circuit conditions, the gradient of the quasi-Fermi potential driving the current is estimated as a function of external bias and charge density. These properties are then related to the respective steady-state current to determine the effective extraction mobility. The new technique is applied to different derivatives of the well-known low-band-gap polymer PCPDTBT blended with PC70BM. We show that the slower average extraction due to lower mobility accounts for the moderate fill factor when solar cells are fabricated with mono- or difluorinated PCPDTBT. This lower extraction competes with improved generation and reduced nongeminate recombination, rendering the monofluorinated derivative the most efficient donor polymer.

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Author:Steve AlbrechtORCiDGND, John R. Tumbleston, Silvia JanietzORCiDGND, Ines Dumsch, Sybille Allard, Ullrich Scherf, Harald W. Ade, Dieter NeherORCiDGND
ISSN:1948-7185 (print)
Pubmed Id:http://www.ncbi.nlm.nih.gov/pubmed?term=26274460
Parent Title (English):The journal of physical chemistry letters
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:1131
Last Page:1138
Funder:BMBF project PVCOMB [FKZ 03IS2151D]; DOE; OS; BES; MSE [DE-FG02-98ER45737]; DOE [DE-AC02-05CH1123]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert