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

Access to Document

10.1016/0379-6779(93)90806-8

Cite this

@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 - http://www.scopus.com/inward/record.url?scp=44949267093&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=44949267093&partnerID=8YFLogxK

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

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this