Photoinduced charge separation and recombination processes in fine particles of oligothiophene-C60 dyad molecules

Mamoru Fujitsuka, Akito Masuhara, Hitoshi Kasai, Hidetoshi Oikawa, Hachiro Nakanishi, Osamu Ito, Takashi Yamashiro, Yoshio Aso, Tetsuo Otsubo

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67 Citations (Scopus)

Abstract

Photoinduced charge separation and recombination processes in fine particles of octathiophene-C60 and dodecathiophene-C60 dyad molecules were investigated by the subpicosecond laser photolysis method. Sizes of the fine particle samples were estimated to be 60-140 nm using SEM observation and dynamic light scattering measurements. Charge separated states were generated within 1 ps upon the 150 fs laser excitation in both fine particle samples of the dyad molecules. Generation yields of the charge separated states were about a half of those of the corresponding dyad molecules in polar solvents, indicating the existence of the competitive deactivation pathways of the singlet excited states, such as exciton migration in each fine particle. On the other hand, the charge separated states deactivated via the two-step-decay processes. Direct charge recombination in a dyad molecule and indirect charge recombination after migration of radical cation (hole) and anion (electron) in fine particles were observed as fast and slow decay components, respectively. The faster charge recombination rates than those of previously reported for aniline-fullerene dyad cluster will result from high hole-mobility in the oligothiophene-moieties of the present dyad molecules composing fine particles.

Original languageEnglish
Pages (from-to)9930-9934
Number of pages5
JournalJournal of Physical Chemistry B
Volume105
Issue number41
DOIs
Publication statusPublished - 2001 Oct 18

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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    Fujitsuka, M., Masuhara, A., Kasai, H., Oikawa, H., Nakanishi, H., Ito, O., Yamashiro, T., Aso, Y., & Otsubo, T. (2001). Photoinduced charge separation and recombination processes in fine particles of oligothiophene-C60 dyad molecules. Journal of Physical Chemistry B, 105(41), 9930-9934. https://doi.org/10.1021/jp0115796