Universität zu Köln

Zitzler-Kunkel, Andre, Lenze, Martin R., Kronenberg, Nils M., Krause, Ana-Maria, Stolte, Matthias, Meerholz, Klaus ORCID: 0000-0001-7450-4672 and Wuerthner, Frank (2014). NIR-Absorbing Merocyanine Dyes for BHJ Solar Cells. Chem. Mat., 26 (16). S. 4856 - 4867. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-5002

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Abstract

We have synthesized a series of new, polymethine chain extended merocyanine dyes 1-4 bearing varied acceptor units and an aminothiophene donor moiety. The optical and electronic properties of these new merocyanines have been studied in comparison with their corresponding lower homologues 5-8, which contain two methine groups less, by UV-vis and electro-optical absorption (EOA) spectroscopy and cyclic voltammetry. The absorption spectra of pi-extended merocyanines are markedly red-shifted, and their extinction coefficients are significantly increased compared to those of their lower homologues. The photovoltaic characteristics of these dyes have been explored in devices using them as donor and PC61BM fullerene as acceptor materials. Our detailed studies reveal that, despite more favorable absorption properties, the it-extended merocyanines exhibit lower short-circuit current densities (J(SC)) as well as decreased open-circuit voltages (V-OC) and power conversion efficiencies (PCE) compared with those of their respective lower homologues. The unexpected decreased J(SC) values could be explained in terms of looser packing features of pi-extended chromophores in the solid state as revealed by single-crystal X-ray analysis of two pairs (1/S and 4/8) of these dyes. By optimization of device setup PCE of 2.3% has been achieved with the Jr-extended donor material 4.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zitzler-Kunkel, Andre UNSPECIFIED UNSPECIFIED UNSPECIFIED Lenze, Martin R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kronenberg, Nils M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Krause, Ana-Maria UNSPECIFIED UNSPECIFIED UNSPECIFIED Stolte, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Wuerthner, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-431847
DOI:	10.1021/cm502302s
Journal or Publication Title:	Chem. Mat.
Volume:	26
Number:	16
Page Range:	S. 4856 - 4867
Date:	2014
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-5002
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 HIGH-PERFORMANCE; SMALL MOLECULES; CONVERSION EFFICIENCY; ORGANIC PHOTOVOLTAICS; ENERGY-CONVERSION; CHARGE-TRANSFER; DONOR; DESIGN; OPTIMIZATION; CHROMOPHORES Multiple languages Chemistry, Physical; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/43184