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 (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:
CreatorsEmailORCIDORCID Put Code
Murrey, Tucker L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hertel, DirkUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nowak, JulianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bruker, RuthUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Limboeck, ThorstenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neudoerfl, JoergUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rueth, StephanieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schelter, JuergenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Olthof, SelinaUNSPECIFIEDorcid.org/0000-0002-8871-1549UNSPECIFIED
Radulescu, AurelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moule, Adam J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meerholz, KlausUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
HETEROJUNCTION SOLAR-CELLS; X-RAY; FILL FACTOR; ARRANGEMENT; MORPHOLOGY; SCATTERING; PACKINGMultiple languages
Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/31939

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