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

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 journal › Conference article › peer-review

Abstract

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 language	English (US)
Pages (from-to)	4707-4713
Number of pages	7
Journal	Synthetic Metals
Volume	57
Issue number	2 -3 pt 6
State	Published - Jan 1 1993
Externally published	Yes
Event	Proceedings of the International Conferece on Science and Technology of Synthetic Metals - Goteborg, Swed Duration: Aug 12 1992 → Aug 18 1992

ASJC Scopus subject areas

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

Cite this

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title = "Solitons and doped β-carotene films: Optical absorption and ESR studies",

abstract = "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.",

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note = "Proceedings of the International Conferece on Science and Technology of Synthetic Metals ; Conference date: 12-08-1992 Through 18-08-1992",

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TY - JOUR

T1 - Solitons and doped β-carotene films

T2 - Proceedings of the International Conferece on Science and Technology of Synthetic Metals

AU - Ehrenfreund, E.

AU - Moses, D.

AU - Lee, K.

AU - Heeger, A. J.

AU - Cornil, J.

AU - Bredas, J. L.

PY - 1993/1/1

Y1 - 1993/1/1

N2 - 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.

AB - 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.

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M3 - Conference article

AN - SCOPUS:0027575062

SN - 0379-6779

VL - 57

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JO - Synthetic Metals

JF - Synthetic Metals

IS - 2 -3 pt 6

Y2 - 12 August 1992 through 18 August 1992

ER -

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

Abstract

ASJC Scopus subject areas

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