Universität zu Köln

Zitzler-Kunkel, Andre, Lenze, Martin R., Schnier, Tobias, Meerholz, Klaus ORCID: 0000-0001-7450-4672 and Wuerthner, Frank (2014). Comparative Studies on Optical, Redox, and Photovoltaic Properties of a Series of D-A-D and Analogous D-A Chromophores. Adv. Funct. Mater., 24 (29). S. 4645 - 4654. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1616-3028

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Abstract

A series of new symmetrical donor-acceptor-donor (D-A-D) dyes based on s-indacene-1,3,5,7(2H,6H)-tetraone as an acceptor unit containing varying electron donating moieties and analogous donor-acceptor (D-A) chromophores with indane-1,3-dione as an acceptor are synthesized. By employing these two sets of dyes, the influence of a scaffold change from unsymmetric push-pull (D-A) to symmetrical (D-A-D) systems on optical, electrochemical, and photovoltaic properties are explored. Detailed comparative studies reveal favorable optical characteristics and considerably decreased bandgaps for the D-A-D dyes compared to those of the reference D-A chromophores. Accordingly, the evaluation of the present dyes as donor materials in bulk heterojunction (BHJ) solar cells in combination with fullerene derivatives PC61BM or PC71BM as acceptors afforded significantly improved performance for devices based on D-A-D blends (up to a factor of 4 compared to the respective D-A reference) with power conversion efficiencies of up to 2.8%. In less polar solvents such as toluene, some of the novel D-A-D chromophores exhibit unexpectedly high fluorescence quantum yields phi(em) of up to unity, in striking contrast to their weakly fluorescent D-A counterparts.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zitzler-Kunkel, Andre UNSPECIFIED UNSPECIFIED UNSPECIFIED Lenze, Martin R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schnier, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Wuerthner, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-432137
DOI:	10.1002/adfm.201400455
Journal or Publication Title:	Adv. Funct. Mater.
Volume:	24
Number:	29
Page Range:	S. 4645 - 4654
Date:	2014
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1616-3028
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ORGANIC SOLAR-CELLS; POWER CONVERSION EFFICIENCY; HIGH-PERFORMANCE; MEROCYANINE DYES; MOLECULAR DESIGN; SYSTEMS; OLIGOTHIOPHENES; SEMICONDUCTORS; INTERLAYER; CATHODE Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/43213