Influence of the sensitizer reduction potential on the sensitivity of photorefractive polymer composites
| Autor: | Klaus Meerholz, Michael Salvador, Francisco Gallego-Gómez, Floris B. Kooistra, Sebastian Koeber, Karina Aleman, Jan C. Hummelen, Svetlana Mansurova |
|---|---|
| Přispěvatelé: | Molecular Energy Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
chemistry.chemical_classification
SOLAR-CELLS Materials science business.industry Open-circuit voltage Near-infrared spectroscopy GLASS General Chemistry Electron Polymer Acceptor Reduction (complexity) OPEN-CIRCUIT VOLTAGE ACCEPTOR ENHANCEMENT chemistry Materials Chemistry Optoelectronics NEAR-INFRARED SENSITIVITY Composite material business Sensitivity (electronics) Order of magnitude |
| Zdroj: | Journal of Materials Chemistry, 20(29), 6170-6175. ROYAL SOC CHEMISTRY |
| ISSN: | 0959-9428 |
| Popis: | We report on a series of near infrared (NIR)-sensitive photorefractive polymer composites (PPCs) based on the hole-conducting polymer PF6-TPD, which are sensitized by soluble fullerene-derivatives as electron-accepting agents. We demonstrate a direct correlation between the electron accepting capability of the sensitizer and the holographic response time. The holographic recording speed is found to improve by one order of magnitude when lowering the reduction potential of the sensitizer by approx. 400 mV, while all other physical parameters of the materials remain essentially identical. Furthermore, the lifetime of the mobile charge carriers is found to correlate linearly with the reduction potential, thus indicating a decrease in recombination rates for stronger accepting capability of the sensitizer. Finally, we found that pre-illumination enhanced the holographic sensitivity. The effect is found to be most pronounced for the strongest acceptor due to reduced recombination of the preformed carriers. Overall, the PPCs reported here feature the currently highest sensitivity in the NIR spectral region. |
| Databáze: | OpenAIRE |
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