Thermal behaviour of dicarboxylic ester bithiophene polymers exhibiting a high open-circuit voltage

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Abstract

Nine different polythiophene derivatives based on dialkyl-(2,2′-bithiophene-5,5′-diyl)-4,4′-dicarboxylate (DCB) alternating with thiophene (T), bithiophene (2T) or thienothiophene (TT) as co-monomer have been synthesized to study the effect of the polymer backbone and side chain length on the thermal properties, the tendency to aggregate, and the photovoltaic performance. Polymers incorporating DCB and 2T show increased crystallinity and a large effect of the side chain length on the morphology of the photoactive layer blends. Thermal annealing increases the crystallinity of the polymers and enhances the long-wavelength light absorption. The concomitant increase in polymer fibre width, however, deteriorates the photovoltaic performance. The best devices were made using the PDCB-2T polymer with 2-butyloctyl side chains providing a power conversion efficiency of 5.18%. The PDCB-T polymer with 2-ethylhexyl substituents shows a comparable efficiency (5.08%), but with a significantly higher open-circuit voltage due to deeper frontier orbitals levels.

Original languageEnglish
Pages (from-to)3731-3742
Number of pages12
JournalJournal of Materials Chemistry C
Volume6
Issue number14
DOIs
Publication statusPublished - 1 Jan 2018

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Open circuit voltage
Esters
Polymers
Chain length
Thiophenes
Light absorption
Thiophene
Conversion efficiency
Hot Temperature
Thermodynamic properties
Monomers
Annealing
Derivatives
Wavelength
Fibers

Cite this

@article{76dcf5c81b3d410781faa57c247cb082,
title = "Thermal behaviour of dicarboxylic ester bithiophene polymers exhibiting a high open-circuit voltage",
abstract = "Nine different polythiophene derivatives based on dialkyl-(2,2′-bithiophene-5,5′-diyl)-4,4′-dicarboxylate (DCB) alternating with thiophene (T), bithiophene (2T) or thienothiophene (TT) as co-monomer have been synthesized to study the effect of the polymer backbone and side chain length on the thermal properties, the tendency to aggregate, and the photovoltaic performance. Polymers incorporating DCB and 2T show increased crystallinity and a large effect of the side chain length on the morphology of the photoactive layer blends. Thermal annealing increases the crystallinity of the polymers and enhances the long-wavelength light absorption. The concomitant increase in polymer fibre width, however, deteriorates the photovoltaic performance. The best devices were made using the PDCB-2T polymer with 2-butyloctyl side chains providing a power conversion efficiency of 5.18{\%}. The PDCB-T polymer with 2-ethylhexyl substituents shows a comparable efficiency (5.08{\%}), but with a significantly higher open-circuit voltage due to deeper frontier orbitals levels.",
author = "Ruurd Heuvel and Colberts, {Fallon J.M.} and Wienk, {Martijn M.} and Janssen, {Ren{\'e} A.J.}",
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doi = "10.1039/c7tc04322h",
language = "English",
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}

Thermal behaviour of dicarboxylic ester bithiophene polymers exhibiting a high open-circuit voltage. / Heuvel, Ruurd; Colberts, Fallon J.M.; Wienk, Martijn M.; Janssen, René A.J.

In: Journal of Materials Chemistry C, Vol. 6, No. 14, 01.01.2018, p. 3731-3742.

Research output: Contribution to journalArticleAcademicpeer-review

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