View : 17 Download: 0

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

Title
Exciton diffusion in near-infrared absorbing solution-processed organic thin films
Authors
Shin H.-Y.Woo J.H.Gwon M.J.Barthelemy M.Vomir M.Muto T.Takaishi K.Uchiyama M.Hashizume D.Aoyama T.Kim D.-W.Yoon S.Bigot J.-Y.Wu J.W.Ribierre J.C.
Ewha Authors
우정원윤석현김동욱Jean Charles Ribierre
SCOPUS Author ID
우정원scopus; 윤석현scopus; 김동욱scopus
Issue Date
2013
Journal Title
Physical Chemistry Chemical Physics
ISSN
1463-9076JCR Link
Citation
vol. 15, no. 8, pp. 2868 - 2872
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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.© 2013 the Owner Societies.
DOI
10.1039/c2cp43705h
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE