How intermolecular geometrical disorder affects the molecular doping of donor-acceptor copolymers

Daniele Di Nuzzo, Claudio Fontanesi, Rebecca Jones, Sybille Allard, Ines Dumsch, Ullrich Scherf, Elizabeth Von Hauff, Stefan Schumacher, Enrico Da Como

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Molecular doping of conjugated polymers represents an important strategy for improving organic electronic devices. However, the widely reported low efficiency of doping remains a crucial limitation to obtain high performance. Here we investigate how charge transfer between dopant and donor-acceptor copolymers is affected by the spatial arrangement of the dopant molecule with respect to the copolymer repeat unit. We p-dope a donor-acceptor copolymer and probe its charge-sensitive molecular vibrations in films by infrared spectroscopy. We find that, compared with a related homopolymer, a four times higher dopant/polymer molar ratio is needed to observe signatures of charges. By DFT methods, we simulate the vibrational spectra, moving the dopant along the copolymer backbone and finding that efficient charge transfer occurs only when the dopant is close to the donor moiety. Our results show that the donor-acceptor structure poses an obstacle to efficient doping, with the acceptor moiety being inactive for p-type doping.

LanguageEnglish
Article number6460
Pages1 - 8
Number of pages8
JournalNature Communications
Volume6
Early online date10 Mar 2015
DOIs
StatusPublished - 10 Mar 2015

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copolymers
Polymers
Copolymers
Doping (additives)
disorders
Vibration
Spectrum Analysis
charge transfer
Equipment and Supplies
high polymers
vibrational spectra
Charge transfer
infrared spectroscopy
signatures
Molecular vibrations
vibration
probes
polymers
Conjugated polymers
electronics

Cite this

How intermolecular geometrical disorder affects the molecular doping of donor-acceptor copolymers. / Di Nuzzo, Daniele; Fontanesi, Claudio; Jones, Rebecca; Allard, Sybille; Dumsch, Ines; Scherf, Ullrich; Von Hauff, Elizabeth; Schumacher, Stefan; Da Como, Enrico.

In: Nature Communications, Vol. 6, 6460, 10.03.2015, p. 1 - 8.

Research output: Contribution to journalArticle

Di Nuzzo, D, Fontanesi, C, Jones, R, Allard, S, Dumsch, I, Scherf, U, Von Hauff, E, Schumacher, S & Da Como, E 2015, 'How intermolecular geometrical disorder affects the molecular doping of donor-acceptor copolymers', Nature Communications, vol. 6, 6460, pp. 1 - 8. https://doi.org/10.1038/ncomms7460
Di Nuzzo, Daniele ; Fontanesi, Claudio ; Jones, Rebecca ; Allard, Sybille ; Dumsch, Ines ; Scherf, Ullrich ; Von Hauff, Elizabeth ; Schumacher, Stefan ; Da Como, Enrico. / How intermolecular geometrical disorder affects the molecular doping of donor-acceptor copolymers. In: Nature Communications. 2015 ; Vol. 6. pp. 1 - 8.
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