| Exciton diffusion in near-infrared absorbing solution-processed organic thin films. | |
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MedLine Citation:
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PMID: 23337941 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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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. |
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Authors:
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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 |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2013-1-22 |
Journal Detail:
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Title: Physical chemistry chemical physics : PCCP Volume: - ISSN: 1463-9084 ISO Abbreviation: Phys Chem Chem Phys Publication Date: 2013 Jan |
Date Detail:
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Created Date: 2013-1-22 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Physics, CNRS Ewha International Research Center, Ewha Womans University, Seoul, Korea. jcribierre@ewha.ac.kr. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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