Ultrafast photoinduced charge generation in conjugated polymers

Daniel Moses, Arthur Dogariu, Alan J. Heeger

Research output: Contribution to journalArticle

84 Scopus citations

Abstract

Transient excited-state absorption measurements in the spectral region spanning the infrared active vibrational active (IRAV) modes in prototypical luminescent polymers, poly(phenylene vinylene), PPV, and poly[2-methoxy-5-(2-ethyl-hexyloxy)-(phenylene vinylene)], MEH-PPV, reveal charge carrier generation within 100 fs after photoexcitation. The photocarrier quantum efficiency in MEH-PPV is φo≈0.1 in zero applied electric field. There is no correlation between the temporal behavior of the photoinduced IRAV signals and the exciton lifetime. Thus, carriers are photoexcited directly and not generated via a secondary process from exciton annihilation. Our data indicate that the carrier recombination rate is sensitive to the strength of the inter-chain interaction.

Original languageEnglish (US)
Pages (from-to)356-360
Number of pages5
JournalChemical Physics Letters
Volume316
Issue number5-6
DOIs
StatePublished - Jan 21 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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