Exciton diffusion in near-infrared absorbing solution-processed organic thin films

H. Y. Shin, J. H. Woo, M. J. Gwon, M. Barthelemy, M. Vomir, T. Muto, K. Takaishi, M. Uchiyama, D. Hashizume, T. Aoyama, D. W. Kim, S. Yoon, J. Y. Bigot, J. W. Wu, J. C. Ribierre

研究成果: ジャーナルへの寄稿学術誌査読

16 被引用数 (Scopus)


We report on singlet-singlet annihilation and exciton diffusion in as-prepared p-type and annealed n-type thin films of the low-bandgap quinoidal quaterthiophene [QQT(CN)4] using ultrafast transient absorption measurements. The decay dynamics of exciton populations are well described by a one-dimensional diffusion-limited bimolecular recombination, indicating that the singlet excitons migrate preferentially along the stacking direction. Our results show that the exciton diffusion constants in QQT(CN)4 films do not vary significantly upon thermal annealing. Exciton diffusion lengths are measured to be as high as 4 and 5 nm in as-prepared and annealed QQT(CN)4 films, respectively. We also observe an influence of the excitation densities on the singlet exciton diffusion, which is attributed to phonon scattering. Because of the possibility of patterning p-n regions in QQT(CN)4 films by thermal nanolithography techniques, this study provides important insight not only into the photophysical properties of quinoidal oligothiophene derivatives but also for their future integration into high-performance p-n nanostructured near infrared light-sensing devices.

ジャーナルPhysical Chemistry Chemical Physics
出版ステータス出版済み - 2月 28 2013

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学一般
  • 物理化学および理論化学


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