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Influence of the sensitizer reduction potential on the sensitivity of photorefractive polymer composites

Koeber, S., Gallego-Gomez, F., Salvador, M., Kooistra, F. B., Hummelen, J. C., Aleman, K., Mansurova, S. & Meerholz, K., 2010, In : Journal of Materials Chemistry. 20, 29, p. 6170-6175 6 p.

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DOI

  • Sebastian Koeber
  • Francisco Gallego-Gomez
  • Michael Salvador
  • Floris B. Kooistra
  • Jan C. Hummelen
  • Karina Aleman
  • Svetlana Mansurova
  • Klaus Meerholz

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.

Original languageEnglish
Pages (from-to)6170-6175
Number of pages6
JournalJournal of Materials Chemistry
Volume20
Issue number29
Publication statusPublished - 2010

    Keywords

  • NEAR-INFRARED SENSITIVITY, OPEN-CIRCUIT VOLTAGE, SOLAR-CELLS, ENHANCEMENT, ACCEPTOR, GLASS

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