Photoinduced carrier generation and decay dynamics in intercalated and non-intercalated polymer

fullerene bulk heterojunctions

William L. Rance, Andrew J. Ferguson, Thomas McCarthy-Ward, Martin Heeney, David S. Ginley, Dana C. Olson, Gary Rumbles, Nikos Kopidakis

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

The dependence of photoinduced carrier generation and decay on donor-acceptor nanomorphology is reported as a function of composition for blends of the polymer poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b] thiophene) (pBTTT-C14) with two electron-accepting fullerenes: phenyl-C71-butyric acid methyl ester (PC71BM) or the bisadduct of phenyl-C61-butyric acid methyl ester (bis-PC 61BM). The formation of partially or fully intercalated bimolecular crystals at weight ratios up to 1:1 for pBTTT-C14:PC71BM blends leads to efficient exciton quenching due to a combination of static and dynamic mechanisms. At higher fullerene loadings, pure PC71BM domains are formed that result in an enhanced free carrier lifetime, as a consequence of spatial separation of the electron and hole into different phases, and the dominant contribution to the photoconductance comes from the high-frequency electron mobility in the fullerene clusters. In the pBTTT-C14:bis- PC61BM system, phase separation results in a non-intercalated structure, independent of composition, which is characterized by exciton quenching that is dominated by a dynamic process, an enhanced carrier lifetime and a hole-dominated photoconductance signal. The results indicate that intercalation of fullerene into crystalline polymer domains is not detrimental to the density of long-lived carriers, suggesting that efficient organic photovoltaic devices could be fabricated that incorporate intercalated structures, provided that an additional pure fullerene phase is present for charge extraction.

Original languageEnglish
Pages (from-to)5635-5646
Number of pages12
JournalACS Nano
Volume5
Issue number7
DOIs
Publication statusPublished - Jul 26 2011

Fingerprint

Fullerenes
Butyric acid
Butyric Acid
butyric acid
fullerenes
Heterojunctions
heterojunctions
Polymers
esters
Esters
polymers
decay
Carrier lifetime
carrier lifetime
Excitons
Quenching
quenching
excitons
Thiophenes
Electrons

Keywords

  • blend
  • conjugated polymer
  • electron transfer
  • fullerene
  • intercalation
  • photoconductance

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Rance, W. L., Ferguson, A. J., McCarthy-Ward, T., Heeney, M., Ginley, D. S., Olson, D. C., ... Kopidakis, N. (2011). Photoinduced carrier generation and decay dynamics in intercalated and non-intercalated polymer: fullerene bulk heterojunctions. ACS Nano, 5(7), 5635-5646. https://doi.org/10.1021/nn201251v

Photoinduced carrier generation and decay dynamics in intercalated and non-intercalated polymer : fullerene bulk heterojunctions. / Rance, William L.; Ferguson, Andrew J.; McCarthy-Ward, Thomas; Heeney, Martin; Ginley, David S.; Olson, Dana C.; Rumbles, Gary; Kopidakis, Nikos.

In: ACS Nano, Vol. 5, No. 7, 26.07.2011, p. 5635-5646.

Research output: Contribution to journalArticle

Rance, WL, Ferguson, AJ, McCarthy-Ward, T, Heeney, M, Ginley, DS, Olson, DC, Rumbles, G & Kopidakis, N 2011, 'Photoinduced carrier generation and decay dynamics in intercalated and non-intercalated polymer: fullerene bulk heterojunctions', ACS Nano, vol. 5, no. 7, pp. 5635-5646. https://doi.org/10.1021/nn201251v
Rance, William L. ; Ferguson, Andrew J. ; McCarthy-Ward, Thomas ; Heeney, Martin ; Ginley, David S. ; Olson, Dana C. ; Rumbles, Gary ; Kopidakis, Nikos. / Photoinduced carrier generation and decay dynamics in intercalated and non-intercalated polymer : fullerene bulk heterojunctions. In: ACS Nano. 2011 ; Vol. 5, No. 7. pp. 5635-5646.
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