Time-resolved terahertz spectroscopy of conjugated polymer/CdSe nanorod composites: [invited]

David Cooke (Invited author), Jun Y. Lek (Invited author), Frederik C Krebs (Invited author), Yeng Ming Lam (Invited author), Peter Uhd Jepsen (Invited author)

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

report ultrafast carrier dynamics in hybrid CdSe nanorod / poly(3-hexythiophene) (P3HT) bulk heterojunction films measured by time-resolved terahertz spectroscopy, and compare to the well studied P3HT/phenyl-C61-butyric acid methyl ester (PCBM) blend. Both films show an improved peak photoconductivity compared to P3HT alone, consistent with efficient charge transfer. The photoconductivity dynamics show fast, picosecond trapping or recombination in the hybrid blend while the all-organic film shows no such loss of mobile charge over ns time scales. The ac conductivity for all samples is well described by a Kramers-Kronig compatible Jonscher-type power law with exponent between 0.5 and 1 suggesting that interchain hopping in the polymer or between nanorods occurs at frequencies higher than 3 THz immediately after photoexcitation.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Volume7600
Pages (from-to)76000H
ISSN0277-786X
DOIs
Publication statusPublished - 2010
EventPhotonics West: Integrated Optoelectronic Devices : Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV - San Francisco, CA, USA
Duration: 1 Jan 2010 → …

Conference

ConferencePhotonics West: Integrated Optoelectronic Devices : Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV
CitySan Francisco, CA, USA
Period01/01/2010 → …

Keywords

  • conjugated polymers
  • ultrafast
  • terahertz
  • conductivity
  • carrier dynamics
  • bulk heterojunctions
  • nanorods
  • Polymer solar cells
  • Solar energy

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