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

E. Ehrenfreund; D. Moses; K. Lee; A. J. Heeger; J. Cornil; J. L. Brédas

doi:10.1016/0379-6779(93)90806-8

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

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

Research output: Contribution to journal › Article › peer-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 language	English (US)
Pages (from-to)	4707-4713
Number of pages	7
Journal	Synthetic Metals
Volume	57
Issue number	2-3
DOIs	https://doi.org/10.1016/0379-6779(93)90806-8
State	Published - Apr 19 1993
Externally published	Yes

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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10.1016/0379-6779(93)90806-8

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@article{8c54eeb4ab194727a22510ed7c924fdc,

title = "Solitons in doped β-carotene films: optical absorption and Esr studies",

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.",

author = "E. Ehrenfreund and D. Moses and K. Lee and Heeger, \{A. J.\} and J. Cornil and Br{\'e}das, \{J. L.\}",

note = "Funding Information: We thank Prof. F. Wudl for helpful discussions and Dr. Yong Cao for help with the AsFs doping. This research was supported by a grant from the National Science Foundation, NSF-PDMR89-15207. E. Ehrenfreund acknowledges a support from the US-Israel Binational Science Foundation (BSF 89-322), Jerusalem (Israel). The work at Mons has been supported partly by SPPS (contract IT/SC/22), the {"}P61e d'Attraction Interuniver-sitaire en Chimie Supramoleculaire et Catalyse{"}, and an IBM Academic Joint Study. The collaboration between UCSB and Mons is supported by international NSF/FNRS grants.",

year = "1993",

month = apr,

day = "19",

doi = "10.1016/0379-6779(93)90806-8",

language = "English (US)",

volume = "57",

pages = "4707--4713",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "Elsevier B.V.",

number = "2-3",

}

TY - JOUR

T1 - Solitons in doped β-carotene films

T2 - optical absorption and Esr studies

AU - Ehrenfreund, E.

AU - Moses, D.

AU - Lee, K.

AU - Heeger, A. J.

AU - Cornil, J.

AU - Brédas, J. L.

N1 - Funding Information: We thank Prof. F. Wudl for helpful discussions and Dr. Yong Cao for help with the AsFs doping. This research was supported by a grant from the National Science Foundation, NSF-PDMR89-15207. E. Ehrenfreund acknowledges a support from the US-Israel Binational Science Foundation (BSF 89-322), Jerusalem (Israel). The work at Mons has been supported partly by SPPS (contract IT/SC/22), the "P61e d'Attraction Interuniver-sitaire en Chimie Supramoleculaire et Catalyse", and an IBM Academic Joint Study. The collaboration between UCSB and Mons is supported by international NSF/FNRS grants.

PY - 1993/4/19

Y1 - 1993/4/19

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/44949267093

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U2 - 10.1016/0379-6779(93)90806-8

DO - 10.1016/0379-6779(93)90806-8

M3 - Article

AN - SCOPUS:44949267093

SN - 0379-6779

VL - 57

SP - 4707

EP - 4713

JO - Synthetic Metals

JF - Synthetic Metals

IS - 2-3

ER -

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

Abstract

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