Photoinduced charge separation in poly(1,4-phenylenevinylene) derivatives studied by electron paramagnetic resonance

E. A. Thomsen; D. J. Keeble; B. Lochab; P. L. Burn; H. El-Mkami; I. D. W. Samuel

doi:10.1016/j.orgel.2008.05.020

Photoinduced charge separation in poly(1,4-phenylenevinylene) derivatives studied by electron paramagnetic resonance

E. A. Thomsen, D. J. Keeble, B. Lochab, P. L. Burn, H. El-Mkami, I. D. W. Samuel

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We report a study of photoincluced charge separation in poly(1,4-phenylenevinylene) (PPV) derivatives with enhanced exciton dissociation using light-induced electron paramagnetic resonance (EPR). Four polymers were studied; all contained alkoxy and fluorenyl side chain units, and two of them also contained a nitro group on the 7-positon of the fluorenyl moieties. Pulsed EPR detected a light induced polaron for all the polymers with the intensity significantly higher for those with nitro groups. A second center was observed for these materials and spectra could be fitted assuming a radical anion was localized on the nitro groups. The fraction of radical anion and polaron centers was comparable, consistent with intramolecular exciton dissociation for the PPV derivatives containing the nitro groups. (C) 2008 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	809-815
Number of pages	7
Journal	Organic Electronics
Volume	9
DOIs	https://doi.org/10.1016/j.orgel.2008.05.020
Publication status	Published - Oct 2008

Keywords

PPVs
exciton dissociation
electron paramagnetic resonance
POLYMER SOLAR-CELLS
POLY(PARA-PHENYLENE VINYLENE)
PHOTOVOLTAIC CELLS
POLARONS
SPECTRA
POLYFLUORENE
DEVICES

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.orgel.2008.05.020

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@article{a43f0acaa38146a390f9bd4366c59a0b,

title = "Photoinduced charge separation in poly(1,4-phenylenevinylene) derivatives studied by electron paramagnetic resonance",

abstract = "We report a study of photoincluced charge separation in poly(1,4-phenylenevinylene) (PPV) derivatives with enhanced exciton dissociation using light-induced electron paramagnetic resonance (EPR). Four polymers were studied; all contained alkoxy and fluorenyl side chain units, and two of them also contained a nitro group on the 7-positon of the fluorenyl moieties. Pulsed EPR detected a light induced polaron for all the polymers with the intensity significantly higher for those with nitro groups. A second center was observed for these materials and spectra could be fitted assuming a radical anion was localized on the nitro groups. The fraction of radical anion and polaron centers was comparable, consistent with intramolecular exciton dissociation for the PPV derivatives containing the nitro groups. (C) 2008 Elsevier B.V. All rights reserved.",

keywords = "PPVs, exciton dissociation, electron paramagnetic resonance, POLYMER SOLAR-CELLS, POLY(PARA-PHENYLENE VINYLENE), PHOTOVOLTAIC CELLS, POLARONS, SPECTRA, POLYFLUORENE, DEVICES",

author = "Thomsen, {E. A.} and Keeble, {D. J.} and B. Lochab and Burn, {P. L.} and H. El-Mkami and Samuel, {I. D. W.}",

year = "2008",

month = oct,

doi = "10.1016/j.orgel.2008.05.020",

language = "English",

volume = "9",

pages = "809--815",

journal = "Organic Electronics",

publisher = "Elsevier",

}

TY - JOUR

T1 - Photoinduced charge separation in poly(1,4-phenylenevinylene) derivatives studied by electron paramagnetic resonance

AU - Thomsen, E. A.

AU - Keeble, D. J.

AU - Lochab, B.

AU - Burn, P. L.

AU - El-Mkami, H.

AU - Samuel, I. D. W.

PY - 2008/10

Y1 - 2008/10

N2 - We report a study of photoincluced charge separation in poly(1,4-phenylenevinylene) (PPV) derivatives with enhanced exciton dissociation using light-induced electron paramagnetic resonance (EPR). Four polymers were studied; all contained alkoxy and fluorenyl side chain units, and two of them also contained a nitro group on the 7-positon of the fluorenyl moieties. Pulsed EPR detected a light induced polaron for all the polymers with the intensity significantly higher for those with nitro groups. A second center was observed for these materials and spectra could be fitted assuming a radical anion was localized on the nitro groups. The fraction of radical anion and polaron centers was comparable, consistent with intramolecular exciton dissociation for the PPV derivatives containing the nitro groups. (C) 2008 Elsevier B.V. All rights reserved.

AB - We report a study of photoincluced charge separation in poly(1,4-phenylenevinylene) (PPV) derivatives with enhanced exciton dissociation using light-induced electron paramagnetic resonance (EPR). Four polymers were studied; all contained alkoxy and fluorenyl side chain units, and two of them also contained a nitro group on the 7-positon of the fluorenyl moieties. Pulsed EPR detected a light induced polaron for all the polymers with the intensity significantly higher for those with nitro groups. A second center was observed for these materials and spectra could be fitted assuming a radical anion was localized on the nitro groups. The fraction of radical anion and polaron centers was comparable, consistent with intramolecular exciton dissociation for the PPV derivatives containing the nitro groups. (C) 2008 Elsevier B.V. All rights reserved.

KW - PPVs

KW - exciton dissociation

KW - electron paramagnetic resonance

KW - POLYMER SOLAR-CELLS

KW - POLY(PARA-PHENYLENE VINYLENE)

KW - PHOTOVOLTAIC CELLS

KW - POLARONS

KW - SPECTRA

KW - POLYFLUORENE

KW - DEVICES

UR - http://www.scopus.com/inward/record.url?scp=49049103925&partnerID=8YFLogxK

U2 - 10.1016/j.orgel.2008.05.020

DO - 10.1016/j.orgel.2008.05.020

M3 - Article

VL - 9

SP - 809

EP - 815

JO - Organic Electronics

JF - Organic Electronics

ER -

Photoinduced charge separation in poly(1,4-phenylenevinylene) derivatives studied by electron paramagnetic resonance

Abstract

Keywords

UN SDGs

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