Dynamics of exciton diffusion in poly(p-phenylene vinylene)/fullerene heterostructures
| Autor: | A. B. Sieval, Paul W. M. Blom, Jan C. Hummelen, D. E. Markov |
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| Přispěvatelé: | Zernike Institute for Advanced Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Materials science
Photoluminescence Fullerene Exciton MEH-PPV FILMS Molecular physics Dissociation (chemistry) Condensed Matter::Materials Science chemistry.chemical_compound Physics::Atomic and Molecular Clusters HETEROJUNCTION EXCITATIONS Condensed Matter::Other Poly(p-phenylene vinylene) Heterojunction DISSOCIATION AGGREGATION Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Fick's laws of diffusion Electronic Optical and Magnetic Materials INTERCHAIN INTERACTIONS Condensed Matter::Soft Condensed Matter chemistry PHOTOLUMINESCENCE Luminescence ENERGY-TRANSFER CONJUGATED POLYMERS PHOTOPHYSICS |
| Zdroj: | Physical Review. B: Condensed Matter and Materials Physics, 72(4):045216, art.-045216. AMER PHYSICAL SOC |
| ISSN: | 1550-235X 0163-1829 1098-0121 |
| Popis: | The exciton diffusion process in a poly($p$-phenylene vinylene)- (PPV-)based derivative is investigated using time-resolved photoluminescence in conjugated polymer/fullerene heterostructures. The decay of the luminescence in the polymer/fullerene heterostructures is governed by exciton diffusion and subsequent dissociation at the polymer/fullerene interface. The decay curves of polymer layers with varying thickness are consistently modeled using an exciton diffusion constant of $3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}∕\mathrm{s}$. The resulting exciton migration radius amounts to $6\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, which is a measure for the active part of the PPV/fullerene heterojunction for photovoltaic applications. |
| Databáze: | OpenAIRE |
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