Molecular weight dependence of exciton diffusion in poly(3-hexylthiophene)

Zarifi Masri; Arvydas Ruseckas; Evguenia V. Emelianova; Linjun Wang; Ashu K. Bansal; Andrew Matheson; Henrik T. Lemke; Martin Meedom Nielsen; Ha Nguyen; Olivier Coulembier; Philippe Dubois; David Beljonne; Ifor D. W. Samuel

doi:10.1002/aenm.201300210

Molecular weight dependence of exciton diffusion in poly(3-hexylthiophene)

Zarifi Masri, Arvydas Ruseckas, Evguenia V. Emelianova, Linjun Wang, Ashu K. Bansal, Andrew Matheson, Henrik T. Lemke, Martin Meedom Nielsen, Ha Nguyen, Olivier Coulembier, Philippe Dubois, David Beljonne, Ifor D. W. Samuel

Department of Physics

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

A joint experimental and theoretical study of singlet exciton diffusion in spin-coated poly(3-hexylthiophene) (P3HT) films and its dependence on molecular weight is presented. The results show that exciton diffusion is fast along the co-facial π–π aggregates of polymer chromophores and about 100 times slower in the lateral direction between aggregates. Exciton hopping between aggregates is found to show a subtle dependence on interchain coupling, aggregate size, and Boltzmann statistics. Additionally, a clear correlation is observed between the effective exciton diffusion coefficient, the degree of aggregation of chromophores, and exciton delocalization along the polymer chain, which suggests that exciton diffusion length can be enhanced by tailored synthesis and processing conditions.

Original language	English
Journal	Advanced Energy Materials
Volume	3
Issue number	11
Pages (from-to)	1445-1453
ISSN	1614-6832
DOIs	https://doi.org/10.1002/aenm.201300210
Publication status	Published - 2013

Keywords

Exciton diffusion
Exciton-exciton annihilation
Poly(3-hexylthiophene)
Molecular weight

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title = "Molecular weight dependence of exciton diffusion in poly(3-hexylthiophene)",

abstract = "A joint experimental and theoretical study of singlet exciton diffusion in spin-coated poly(3-hexylthiophene) (P3HT) films and its dependence on molecular weight is presented. The results show that exciton diffusion is fast along the co-facial π–π aggregates of polymer chromophores and about 100 times slower in the lateral direction between aggregates. Exciton hopping between aggregates is found to show a subtle dependence on interchain coupling, aggregate size, and Boltzmann statistics. Additionally, a clear correlation is observed between the effective exciton diffusion coefficient, the degree of aggregation of chromophores, and exciton delocalization along the polymer chain, which suggests that exciton diffusion length can be enhanced by tailored synthesis and processing conditions.",

keywords = "Exciton diffusion, Exciton-exciton annihilation, Poly(3-hexylthiophene), Molecular weight",

author = "Zarifi Masri and Arvydas Ruseckas and Emelianova, {Evguenia V.} and Linjun Wang and Bansal, {Ashu K.} and Andrew Matheson and Lemke, {Henrik T.} and Nielsen, {Martin Meedom} and Ha Nguyen and Olivier Coulembier and Philippe Dubois and David Beljonne and Samuel, {Ifor D. W.}",

year = "2013",

doi = "10.1002/aenm.201300210",

language = "English",

volume = "3",

pages = "1445--1453",

journal = "Advanced Energy Materials",

issn = "1614-6832",

publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",

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TY - JOUR

T1 - Molecular weight dependence of exciton diffusion in poly(3-hexylthiophene)

AU - Masri, Zarifi

AU - Ruseckas, Arvydas

AU - Emelianova, Evguenia V.

AU - Wang, Linjun

AU - Bansal, Ashu K.

AU - Matheson, Andrew

AU - Lemke, Henrik T.

AU - Nielsen, Martin Meedom

AU - Nguyen, Ha

AU - Coulembier, Olivier

AU - Dubois, Philippe

AU - Beljonne, David

AU - Samuel, Ifor D. W.

PY - 2013

Y1 - 2013

N2 - A joint experimental and theoretical study of singlet exciton diffusion in spin-coated poly(3-hexylthiophene) (P3HT) films and its dependence on molecular weight is presented. The results show that exciton diffusion is fast along the co-facial π–π aggregates of polymer chromophores and about 100 times slower in the lateral direction between aggregates. Exciton hopping between aggregates is found to show a subtle dependence on interchain coupling, aggregate size, and Boltzmann statistics. Additionally, a clear correlation is observed between the effective exciton diffusion coefficient, the degree of aggregation of chromophores, and exciton delocalization along the polymer chain, which suggests that exciton diffusion length can be enhanced by tailored synthesis and processing conditions.

AB - A joint experimental and theoretical study of singlet exciton diffusion in spin-coated poly(3-hexylthiophene) (P3HT) films and its dependence on molecular weight is presented. The results show that exciton diffusion is fast along the co-facial π–π aggregates of polymer chromophores and about 100 times slower in the lateral direction between aggregates. Exciton hopping between aggregates is found to show a subtle dependence on interchain coupling, aggregate size, and Boltzmann statistics. Additionally, a clear correlation is observed between the effective exciton diffusion coefficient, the degree of aggregation of chromophores, and exciton delocalization along the polymer chain, which suggests that exciton diffusion length can be enhanced by tailored synthesis and processing conditions.

KW - Exciton diffusion

KW - Exciton-exciton annihilation

KW - Poly(3-hexylthiophene)

KW - Molecular weight

U2 - 10.1002/aenm.201300210

DO - 10.1002/aenm.201300210

M3 - Journal article

SN - 1614-6832

VL - 3

SP - 1445

EP - 1453

JO - Advanced Energy Materials

JF - Advanced Energy Materials

IS - 11

ER -

Molecular weight dependence of exciton diffusion in poly(3-hexylthiophene)

Abstract

Keywords

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