Exciton Quenching Close to Polymer−Vacuum Interface of Spin-Coated Films of Poly(p-phenylenevinylene) Derivative
| Autor: | Oleksandr V. Mikhnenko, Fabrizio Cordella, Alexander B. Sieval, Maria Antonietta Loi, Paul W. M. Blom, Jan C. Hummelen |
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| Přispěvatelé: | Zernike Institute for Advanced Materials |
| Rok vydání: | 2009 |
| Předmět: |
SOLAR-CELLS
POLYTHIOPHENE Photoluminescence Materials science Exciton MEH-PPV Photochemistry Condensed Matter::Materials Science THIN-FILMS Materials Chemistry HETEROJUNCTION Physical and Theoretical Chemistry Thin film DIFFUSION LENGTH Quenching chemistry.chemical_classification Quantitative Biology::Biomolecules Bilayer Intermolecular force CONJUGATED POLYMER Heterojunction DISSOCIATION Polymer Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Surfaces Coatings and Films Condensed Matter::Soft Condensed Matter chemistry Chemical physics PHOTOLUMINESCENCE CHARGE SEPARATION |
| Zdroj: | Journal of Physical Chemistry B, 113(27), 9104-9109. AMER CHEMICAL SOC |
| ISSN: | 1520-5207 1520-6106 1089-5647 |
| DOI: | 10.1021/jp9012637 |
| Popis: | Polymer-fullerene bilayer heterostructures are suited to study excitonic processes in conjugated polymers. Excitons are efficiently quenched at the polymer-fullerene interface, whereas the polymer-vacuum interface is often considered as an exciton-reflecting interface. Here, we report about efficient exciton quenching close to the polymer-vacuum interface of spin-coated MDMO-PPV (poly[2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylenevinylene]) films. The quenching efficiency is estimated to be as high as that of the polymer-fullerene interface. This efficient quenching is consistent with enhanced intermolecular interactions close to the polymer-vacuum interface due to the formation of a "skin layer" during the spin-coating procedure. In the skin layer, the polymer density is higher; that is, the intermolecular distances are shorter than in the rest of the film. The effect of exciton quenching at the polymer-vacuum interface should be taken into account when the thickness of the polymer film is on the order of the exciton diffusion length; in particular, in the determination of the exciton diffusion length. © 2009 American Chemical Society. |
| Databáze: | OpenAIRE |
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