Ultrafast photoinduced charge generation in conjugated polymers

Daniel Moses; Arthur Dogariu; Alan J. Heeger

doi:10.1016/S0009-2614(99)01316-0

Ultrafast photoinduced charge generation in conjugated polymers

Daniel Moses
, Arthur Dogariu
, Alan J. Heeger

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

91 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 φ_o≈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 inter-chain interaction.

Original language	English (US)
Pages (from-to)	356-360
Number of pages	5
Journal	Chemical Physics Letters
Volume	316
Issue number	5-6
DOIs	https://doi.org/10.1016/S0009-2614(99)01316-0
State	Published - Jan 21 2000
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/S0009-2614(99)01316-0

Cite this

@article{786ee7b926d1440aacd3fb97d23c9e77,

title = "Ultrafast photoinduced charge generation 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 φo≈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 inter-chain 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 AgGaSe 2 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 = "2000",

month = jan,

day = "21",

doi = "10.1016/S0009-2614(99)01316-0",

language = "English (US)",

volume = "316",

pages = "356--360",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier B.V.",

number = "5-6",

}

TY - JOUR

T1 - Ultrafast photoinduced charge generation 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 AgGaSe 2 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 - 2000/1/21

Y1 - 2000/1/21

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 φo≈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 inter-chain 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 φo≈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 inter-chain interaction.

UR - https://www.scopus.com/pages/publications/0042528011

UR - https://www.scopus.com/pages/publications/0042528011#tab=citedBy

U2 - 10.1016/S0009-2614(99)01316-0

DO - 10.1016/S0009-2614(99)01316-0

M3 - Article

AN - SCOPUS:0042528011

SN - 0009-2614

VL - 316

SP - 356

EP - 360

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 5-6

ER -

Ultrafast photoinduced charge generation in conjugated polymers

Abstract

All Science Journal Classification (ASJC) codes

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