Solitons and doped β-carotene films: Optical absorption and ESR studies

E. Ehrenfreund, D. Moses, K. Lee, A. J. Heeger, J. Cornil, J. L. Bredas

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations


We present optical absorption 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 a 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
Issue number2 -3 pt 6
StatePublished - Jan 1 1993
Externally publishedYes
EventProceedings of the International Conferece on Science and Technology of Synthetic Metals - Goteborg, Swed
Duration: Aug 12 1992Aug 18 1992

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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