Affordable Access

Publisher Website

Mechanism of carrier generation and recombination in conjugated polymers

Authors
Journal
Synthetic Metals
0379-6779
Publisher
Elsevier
Publication Date
Volume
116
Identifiers
DOI: 10.1016/s0379-6779(00)00506-3
Keywords
  • Conjugated Polymers
  • Carrier Generation
  • Carrier Recombination
Disciplines
  • Physics

Abstract

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 φ 0≈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 interchain interaction.

There are no comments yet on this publication. Be the first to share your thoughts.