Solitons in doped β-carotene films: optical absorption and Esr studies

E. Ehrenfreund*, D. Moses, K. Lee, A. J. Heeger, J. Cornil, Jean-Luc Bredas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present opticalabsorption and electron spin resonance studies of iodine and AsF5 doped β-carotene films. We show that stable soliton-like defects are formed upon p-doping. The spin to charge ratio found experimentally is ∼-0.02, indicating that nearly all defects are spinless. The absorption spectrum is characterized by a single intragap band and set of infrared active vibration lines; evidence that there is significant structural relaxation upon charge transfer. A possible spinless species is the dication in which two soliton defects are formed. The small number of spins observed are probably due to β-carotene radical cations.

Original languageEnglish (US)
Pages (from-to)4707-4713
Number of pages7
JournalSynthetic Metals
Volume57
Issue number2-3
DOIs
StatePublished - Apr 19 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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