Universität zu Köln

Murrey, Tucker L., Hertel, Dirk, Nowak, Julian, Bruker, Ruth, Limboeck, Thorsten, Neudoerfl, Joerg, Rueth, Stephanie, Schelter, Juergen, Olthof, Selina ORCID: 0000-0002-8871-1549, Radulescu, Aurel, Moule, Adam J. and Meerholz, Klaus ORCID: 0000-0001-7450-4672 (2020). Investigation of Hierarchical Structure Formation in Merocyanine Photovoltaics. J. Phys. Chem. C, 124 (36). S. 19457 - 19467. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7455

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Abstract

Merocyanines (MCs) are a versatile class of small-molecule dyes. Their optoelectronic properties are easily tunable by chemically controlling their donor-acceptor strength, and their structural properties can be tuned by simple side-chain substitution. This manuscript demonstrates a novel series of MCs featuring an indoline donor with varying hydrocarbon side-chain length (from 6 to 12 carbons) and a tert-butyl-thiazole acceptor, labeled InTBT. Bulk heterojunction organic photovoltaics are fabricated with a [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) acceptor and characterized. Films composed of I8TBT:PCBM and I9TBT:PCBM produced the highest power conversion efficiency of 4.5%, which suggests that the morphology is optimized by controlling the side-chain length. Hierarchical structure formation in InTBT:PCBM films is studied using grazing incidence X-ray diffraction (GIXRD), small-angle neutron scattering (SANS), and atomic force microscopy (AFM). When mixed with PCBM, InTBTs with <= 8 side-chain carbons form pure crystalline domains, while InTBTs with >= 9 side-chain carbons mix well with PCBM. SANS demonstrates that increasing side-chain length increases the InTBT-rich domain size. In addition, a branched hexyl-dodecyl side-chain IHDTBT:PCBM film was studied and found to exhibit the worst-performance organic photovoltaic (OPV) device. The large-branched side chain inhibited mixing between IHDTBT and PCBM resulting in large segregated phases.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Murrey, Tucker L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hertel, Dirk UNSPECIFIED UNSPECIFIED UNSPECIFIED Nowak, Julian UNSPECIFIED UNSPECIFIED UNSPECIFIED Bruker, Ruth UNSPECIFIED UNSPECIFIED UNSPECIFIED Limboeck, Thorsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Neudoerfl, Joerg UNSPECIFIED UNSPECIFIED UNSPECIFIED Rueth, Stephanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Schelter, Juergen UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED Radulescu, Aurel UNSPECIFIED UNSPECIFIED UNSPECIFIED Moule, Adam J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-319394
DOI:	10.1021/acs.jpcc.0c04988
Journal or Publication Title:	J. Phys. Chem. C
Volume:	124
Number:	36
Page Range:	S. 19457 - 19467
Date:	2020
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1932-7455
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 HETEROJUNCTION SOLAR-CELLS; X-RAY; FILL FACTOR; ARRANGEMENT; MORPHOLOGY; SCATTERING; PACKING Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/31939