Ultrafast photogeneration of inter-chain charge pairs in polythiophene films

A Ruseckas; M Theander; MR Andersson; M Svensson; M Prato; O Inganas; null Sundstrom

Ultrafast photogeneration of inter-chain charge pairs in polythiophene films

A Ruseckas, M Theander, MR Andersson, M Svensson, M Prato, O Inganas, Sundstrom

School of Physics and Astronomy

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

Abstract

Photoexcitation dynamics in films of polythiophenes with different side groups were studied by transient absorption spectroscopy using 80 fs pulses. We show that inter-chain charge pairs (CP) are generated with similar to 20% efficiency in a polymer with short inter-chain distance (similar to 4 Angstrom) within 100 fs after photoexcitation. We discuss two mechanisms for inter-chain charge separation: (i) electron or hole transfer from an initially excited intra-chain singlet state or (ii) optical excitation of mixed exciton-charge transfer states, which quickly evolve to inter-chain CPs. (C) 2000 Elsevier Science B.V, All rights reserved.

Original language	English
Pages (from-to)	136-142
Number of pages	7
Journal	Chemical Physics Letters
Volume	322
Issue number	1-2
Publication status	Published - 12 May 2000

Keywords

LIGHT-EMITTING-DIODES
CONJUGATED POLYMERS
SUBSTITUTED POLYTHIOPHENES
POLARON PAIRS
PHOTOLUMINESCENCE
LUMINESCENCE
PHOTOPHYSICS
DERIVATIVES
COMPOSITES
ELECTRON

Cite this

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title = "Ultrafast photogeneration of inter-chain charge pairs in polythiophene films",

abstract = "Photoexcitation dynamics in films of polythiophenes with different side groups were studied by transient absorption spectroscopy using 80 fs pulses. We show that inter-chain charge pairs (CP) are generated with similar to 20% efficiency in a polymer with short inter-chain distance (similar to 4 Angstrom) within 100 fs after photoexcitation. We discuss two mechanisms for inter-chain charge separation: (i) electron or hole transfer from an initially excited intra-chain singlet state or (ii) optical excitation of mixed exciton-charge transfer states, which quickly evolve to inter-chain CPs. (C) 2000 Elsevier Science B.V, All rights reserved.",

keywords = "LIGHT-EMITTING-DIODES, CONJUGATED POLYMERS, SUBSTITUTED POLYTHIOPHENES, POLARON PAIRS, PHOTOLUMINESCENCE, LUMINESCENCE, PHOTOPHYSICS, DERIVATIVES, COMPOSITES, ELECTRON",

author = "A Ruseckas and M Theander and MR Andersson and M Svensson and M Prato and O Inganas and Sundstrom",

year = "2000",

month = may,

day = "12",

language = "English",

volume = "322",

pages = "136--142",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier Science BV",

number = "1-2",

}

TY - JOUR

T1 - Ultrafast photogeneration of inter-chain charge pairs in polythiophene films

AU - Ruseckas, A

AU - Theander, M

AU - Andersson, MR

AU - Svensson, M

AU - Prato, M

AU - Inganas, O

AU - Sundstrom, null

PY - 2000/5/12

Y1 - 2000/5/12

N2 - Photoexcitation dynamics in films of polythiophenes with different side groups were studied by transient absorption spectroscopy using 80 fs pulses. We show that inter-chain charge pairs (CP) are generated with similar to 20% efficiency in a polymer with short inter-chain distance (similar to 4 Angstrom) within 100 fs after photoexcitation. We discuss two mechanisms for inter-chain charge separation: (i) electron or hole transfer from an initially excited intra-chain singlet state or (ii) optical excitation of mixed exciton-charge transfer states, which quickly evolve to inter-chain CPs. (C) 2000 Elsevier Science B.V, All rights reserved.

AB - Photoexcitation dynamics in films of polythiophenes with different side groups were studied by transient absorption spectroscopy using 80 fs pulses. We show that inter-chain charge pairs (CP) are generated with similar to 20% efficiency in a polymer with short inter-chain distance (similar to 4 Angstrom) within 100 fs after photoexcitation. We discuss two mechanisms for inter-chain charge separation: (i) electron or hole transfer from an initially excited intra-chain singlet state or (ii) optical excitation of mixed exciton-charge transfer states, which quickly evolve to inter-chain CPs. (C) 2000 Elsevier Science B.V, All rights reserved.

KW - LIGHT-EMITTING-DIODES

KW - CONJUGATED POLYMERS

KW - SUBSTITUTED POLYTHIOPHENES

KW - POLARON PAIRS

KW - PHOTOLUMINESCENCE

KW - LUMINESCENCE

KW - PHOTOPHYSICS

KW - DERIVATIVES

KW - COMPOSITES

KW - ELECTRON

M3 - Article

SN - 0009-2614

VL - 322

SP - 136

EP - 142

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 1-2

ER -

Ultrafast photogeneration of inter-chain charge pairs in polythiophene films

Abstract

Keywords

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