Mechanism of carrier generation and recombination in conjugated polymers

Daniel Moses; Arthur Dogariu; Alan J. Heeger

doi:10.1016/S0379-6779(00)00506-3

Mechanism of carrier generation and recombination in conjugated polymers

Daniel Moses, Arthur Dogariu, Alan J. Heeger

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

17 Scopus citations

Abstract

Transient excited-state absorption measurements in the spectral region spanning the infrared active vibrational active (IRAV) modes in prototypical luminescent polymers, poly(phenylene vinylene) (PPV), and poly[2-methoxy-5-(2-ethyl-hexyloxy)-(phenylene vinylene)] (MEH-PPV), reveal charge carrier generation within 100 fs after photoexcitation. The photocarrier quantum efficiency in MEH-PPV is φ₀≈0.1 in zero applied electric field. There is no correlation between the temporal behavior of the photoinduced IRAV signals and the exciton lifetime. Thus, carriers are photoexcited directly and not generated via a secondary process from exciton annihilation. Our data indicate that the carrier recombination rate is sensitive to the strength of the interchain interaction.

Original language	English (US)
Pages (from-to)	19-22
Number of pages	4
Journal	Synthetic Metals
Volume	116
Issue number	1-3
DOIs	https://doi.org/10.1016/S0379-6779(00)00506-3
State	Published - Jan 1 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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@article{7a20c777a54d441b9190f0a643112a06,

title = "Mechanism of carrier generation and recombination in conjugated polymers",

abstract = "Transient excited-state absorption measurements in the spectral region spanning the infrared active vibrational active (IRAV) modes in prototypical luminescent polymers, poly(phenylene vinylene) (PPV), and poly[2-methoxy-5-(2-ethyl-hexyloxy)-(phenylene vinylene)] (MEH-PPV), reveal charge carrier generation within 100 fs after photoexcitation. The photocarrier quantum efficiency in MEH-PPV is φ0≈0.1 in zero applied electric field. There is no correlation between the temporal behavior of the photoinduced IRAV signals and the exciton lifetime. Thus, carriers are photoexcited directly and not generated via a secondary process from exciton annihilation. Our data indicate that the carrier recombination rate is sensitive to the strength of the interchain interaction.",

author = "Daniel Moses and Arthur Dogariu and Heeger, {Alan J.}",

note = "Funding Information: We are grateful to Prof. E.W. van Stryland and Dr. D. McBranch for providing us with AgGaSe2 crystal, and to Jian Wang for assistance with sample preparation. Dr. D. McBranch pointed out the importance of the different time scales observed for carrier decay and exciton decay. This research was supported by the Air Force Office of Scientific Research (Charles Lee, Program Officer) under F49620-99-1-0031.",

year = "2001",

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doi = "10.1016/S0379-6779(00)00506-3",

language = "English (US)",

volume = "116",

pages = "19--22",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Mechanism of carrier generation and recombination in conjugated polymers

AU - Moses, Daniel

AU - Dogariu, Arthur

AU - Heeger, Alan J.

N1 - Funding Information: We are grateful to Prof. E.W. van Stryland and Dr. D. McBranch for providing us with AgGaSe2 crystal, and to Jian Wang for assistance with sample preparation. Dr. D. McBranch pointed out the importance of the different time scales observed for carrier decay and exciton decay. This research was supported by the Air Force Office of Scientific Research (Charles Lee, Program Officer) under F49620-99-1-0031.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Transient excited-state absorption measurements in the spectral region spanning the infrared active vibrational active (IRAV) modes in prototypical luminescent polymers, poly(phenylene vinylene) (PPV), and poly[2-methoxy-5-(2-ethyl-hexyloxy)-(phenylene vinylene)] (MEH-PPV), reveal charge carrier generation within 100 fs after photoexcitation. The photocarrier quantum efficiency in MEH-PPV is φ0≈0.1 in zero applied electric field. There is no correlation between the temporal behavior of the photoinduced IRAV signals and the exciton lifetime. Thus, carriers are photoexcited directly and not generated via a secondary process from exciton annihilation. Our data indicate that the carrier recombination rate is sensitive to the strength of the interchain interaction.

AB - Transient excited-state absorption measurements in the spectral region spanning the infrared active vibrational active (IRAV) modes in prototypical luminescent polymers, poly(phenylene vinylene) (PPV), and poly[2-methoxy-5-(2-ethyl-hexyloxy)-(phenylene vinylene)] (MEH-PPV), reveal charge carrier generation within 100 fs after photoexcitation. The photocarrier quantum efficiency in MEH-PPV is φ0≈0.1 in zero applied electric field. There is no correlation between the temporal behavior of the photoinduced IRAV signals and the exciton lifetime. Thus, carriers are photoexcited directly and not generated via a secondary process from exciton annihilation. Our data indicate that the carrier recombination rate is sensitive to the strength of the interchain interaction.

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U2 - 10.1016/S0379-6779(00)00506-3

DO - 10.1016/S0379-6779(00)00506-3

M3 - Article

AN - SCOPUS:0034817892

SN - 0379-6779

VL - 116

SP - 19

EP - 22

JO - Synthetic Metals

JF - Synthetic Metals

IS - 1-3

ER -

Mechanism of carrier generation and recombination in conjugated polymers

Abstract

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