Ultrafast Excitation Transfer and Trapping in a Thin Polymer Film.

Mette Grage; Yuri Zausjitsyn; Arkady Yartsev; Mirianas Chachisvilis; Villy Sundström; Tönu Pullerits

doi:10.1103/PhysRevB.67.205207

Ultrafast Excitation Transfer and Trapping in a Thin Polymer Film.

Mette Grage, Yuri Zausjitsyn, Arkady Yartsev, Mirianas Chachisvilis, Villy Sundström, Tönu Pullerits

Chemical Physics

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

Abstract

Transient absorption anisotropy of a polythiophene polymer in a thin film was studied on a femtosecond time scale. The anisotropy has a non-exponential decay on the sub-picosecond time scale, with a fastest component characterized by an ∼40 fs time constant. To simulate the anisotropy decay an incoherent energy migration model has been used. Comparison between the simulated and experimental kinetics enabled us to estimate the nearest-neighbor pair wise hopping time (τh=1±0.1 ps), the fraction of the interchain aggregates (∼10%) and the structural disorder of the polymer. The initial ∼30 fs anisotropy decay does not originate from incoherent hopping energy transfer but from some other relaxation among electronic excited states within a spectroscopic unit.

Original language	English
Pages (from-to)	205207-1-205207-5
Journal	Physical Review B (Condensed Matter and Materials Physics)
Volume	67
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.67.205207
Publication status	Published - 2003

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Chemical Physics (S) (011001060)

Subject classification (UKÄ)

Atom and Molecular Physics and Optics

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10.1103/PhysRevB.67.205207

Cite this

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title = "Ultrafast Excitation Transfer and Trapping in a Thin Polymer Film.",

abstract = "Transient absorption anisotropy of a polythiophene polymer in a thin film was studied on a femtosecond time scale. The anisotropy has a non-exponential decay on the sub-picosecond time scale, with a fastest component characterized by an ∼40 fs time constant. To simulate the anisotropy decay an incoherent energy migration model has been used. Comparison between the simulated and experimental kinetics enabled us to estimate the nearest-neighbor pair wise hopping time (τh=1±0.1 ps), the fraction of the interchain aggregates (∼10\%) and the structural disorder of the polymer. The initial ∼30 fs anisotropy decay does not originate from incoherent hopping energy transfer but from some other relaxation among electronic excited states within a spectroscopic unit.",

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year = "2003",

doi = "10.1103/PhysRevB.67.205207",

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AU - Grage, Mette

AU - Zausjitsyn, Yuri

AU - Yartsev, Arkady

AU - Chachisvilis, Mirianas

AU - Sundström, Villy

AU - Pullerits, Tönu

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)

PY - 2003

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N2 - Transient absorption anisotropy of a polythiophene polymer in a thin film was studied on a femtosecond time scale. The anisotropy has a non-exponential decay on the sub-picosecond time scale, with a fastest component characterized by an ∼40 fs time constant. To simulate the anisotropy decay an incoherent energy migration model has been used. Comparison between the simulated and experimental kinetics enabled us to estimate the nearest-neighbor pair wise hopping time (τh=1±0.1 ps), the fraction of the interchain aggregates (∼10%) and the structural disorder of the polymer. The initial ∼30 fs anisotropy decay does not originate from incoherent hopping energy transfer but from some other relaxation among electronic excited states within a spectroscopic unit.

AB - Transient absorption anisotropy of a polythiophene polymer in a thin film was studied on a femtosecond time scale. The anisotropy has a non-exponential decay on the sub-picosecond time scale, with a fastest component characterized by an ∼40 fs time constant. To simulate the anisotropy decay an incoherent energy migration model has been used. Comparison between the simulated and experimental kinetics enabled us to estimate the nearest-neighbor pair wise hopping time (τh=1±0.1 ps), the fraction of the interchain aggregates (∼10%) and the structural disorder of the polymer. The initial ∼30 fs anisotropy decay does not originate from incoherent hopping energy transfer but from some other relaxation among electronic excited states within a spectroscopic unit.

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ER -

Ultrafast Excitation Transfer and Trapping in a Thin Polymer Film.

Abstract

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