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On the field dependence of free charge carrier generation and recombination in blends of PCPDTBT/PC70BM influence of solvent additives

  • We have applied time-delayed collection field (TDCF) and charge extraction by linearly increasing voltage (CELIV) to investigate the photogeneration, transport, and recombination of charge carriers in blends composed of PCPDTBT/PC70BM processed with and without the solvent additive diiodooctane. The results suggest that the solvent additive has severe impacts on the elementary processes involved in the photon to collected electron conversion in these blends. First, a pronounced field dependence of the free carrier generation is found for both blends, where the field dependence is stronger without the additive. Second, the fate of charge carriers in both blends can be described with a rather high bimolecular recombination coefficients, which increase with decreasing internal field. Third, the mobility is three to four times higher with the additive. Both blends show a negative field dependence of mobility, which we suggest to cause bias-dependent recombination coefficients.

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Author:Steve AlbrechtGND, Wolfram Schindler, Jona Kurpiers, Juliane Kniepert, James C. Blakesley, Ines Dumsch, Sybille Allard, Konstantinos Fostiropoulos, Ullrich Scherf, Dieter NeherORCiDGND
ISSN:1948-7185 (print)
Parent Title (English):The journal of physical chemistry letters
Publisher:American Chemical Society
Place of publication:Washington
Document Type:Article
Year of first Publication:2012
Year of Completion:2012
Release Date:2017/03/26
First Page:640
Last Page:645
Funder:Bundesministerium fur Bildung und Forschung (BMBF) within the PVcomB [FKZ 03IS2151D]; SOHyb [FKZ 03X3525A]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert