Photoexcited states in poly(3-alkyl thienylenes)

J. Ruher, Nicholas Colaneri, D. D C Bradley, R. H. Friend, G. Wegner

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

The authors present a comparative study of the properties of two solution-processible alkyl-substituted polythienylenes, poly(3-hexyl thienylene), P3HT and poly(3-dodecyl thienylene), P3DT. Both show the onset of pi - pi * interband absorption at 2 eV with the peak in absorption coefficient near 2.5 eV, and both show strong photoluminescence in an energy band extending from 1.3 to 2 eV. These properties are both due to intra-chain absorption across the pi - pi * gap, with the photoluminescence arising from the radiative decay of the singlet exciton. For the case of P3HT, photoinduced absorption measurements show the presence of two subgap absorption bands, which are associated with the formation of charged bipolarons which require charge separation between chains. P3DT, in contrast, shows a single induced absorption band, at 1 eV, which shows very different temperature and frequency dependence from that of the bipolaron bands in P3HT. The authors consider that a triplet-triplet transition of the triplet intrachain exciton is a possible assignment for this band, and consider that poorer contact between chains in P3DT over that in P3HT inhibits the transfer of charge between chains and thus prevents the formation of charged bipolarons in this polymer. They also discuss the role of the polymer structure in the stabilisation of the photogenerated bipolarons.

Original languageEnglish (US)
Article number017
Pages (from-to)5465-5477
Number of pages13
JournalJournal of Physics: Condensed Matter
Volume2
Issue number24
DOIs
StatePublished - 1990
Externally publishedYes

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Excitons
Absorption spectra
Photoluminescence
Polymers
Electron transitions
Band structure
Stabilization
excitons
absorption spectra
photoluminescence
polymers
polarization (charge separation)
energy bands
absorptivity
stabilization
Temperature
temperature dependence
LDS 751
decay

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Ruher, J., Colaneri, N., Bradley, D. D. C., Friend, R. H., & Wegner, G. (1990). Photoexcited states in poly(3-alkyl thienylenes). Journal of Physics: Condensed Matter, 2(24), 5465-5477. [017]. https://doi.org/10.1088/0953-8984/2/24/017

Photoexcited states in poly(3-alkyl thienylenes). / Ruher, J.; Colaneri, Nicholas; Bradley, D. D C; Friend, R. H.; Wegner, G.

In: Journal of Physics: Condensed Matter, Vol. 2, No. 24, 017, 1990, p. 5465-5477.

Research output: Contribution to journalArticle

Ruher, J, Colaneri, N, Bradley, DDC, Friend, RH & Wegner, G 1990, 'Photoexcited states in poly(3-alkyl thienylenes)', Journal of Physics: Condensed Matter, vol. 2, no. 24, 017, pp. 5465-5477. https://doi.org/10.1088/0953-8984/2/24/017
Ruher J, Colaneri N, Bradley DDC, Friend RH, Wegner G. Photoexcited states in poly(3-alkyl thienylenes). Journal of Physics: Condensed Matter. 1990;2(24):5465-5477. 017. https://doi.org/10.1088/0953-8984/2/24/017
Ruher, J. ; Colaneri, Nicholas ; Bradley, D. D C ; Friend, R. H. ; Wegner, G. / Photoexcited states in poly(3-alkyl thienylenes). In: Journal of Physics: Condensed Matter. 1990 ; Vol. 2, No. 24. pp. 5465-5477.
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