Modelling exciton diffusion in disordered conjugated polymers

S Athanasopoulos; E V Emelianova; Alison B Walker; D Beljonne

doi:10.1117/12.854434

Modelling exciton diffusion in disordered conjugated polymers

S Athanasopoulos, E V Emelianova, Alison B Walker, D Beljonne

Department of Physics

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Abstract

We present a combined quantum-chemical and Monte Carlo approach for calculating exciton transport properties in disordered organic materials starting from the molecular scale. We show that traps and energetic disorder are the main limitations for exciton diffusion in conjugated polymers. An analytical model for exciton hopping in a medium of sites with uncorellated energetic disorder gives a quantitative description on the dependence of the diffusion length to both the energetic disorder strength and temperature. We demonstrate how traps and energetic disorder can pin down the diffusion length in conjugated polymers to values below 10 nm.

Original language	English
Article number	772214
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7722
DOIs	https://doi.org/10.1117/12.854434
Publication status	Published - 2010
Event	Organic Photonics IV, April 12, 2009 - April 15, 2009 - Brussels, Belgium Duration: 1 Jan 2010 → …

Bibliographical note

Organic Photonics IV. 12-15 April 2009. Brussels, Belgium.

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10.1117/12.854434

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Copyright 2010 (year) Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Accepted author manuscript, 1.26 MB

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AU - Emelianova, E V

AU - Walker, Alison B

AU - Beljonne, D

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AB - We present a combined quantum-chemical and Monte Carlo approach for calculating exciton transport properties in disordered organic materials starting from the molecular scale. We show that traps and energetic disorder are the main limitations for exciton diffusion in conjugated polymers. An analytical model for exciton hopping in a medium of sites with uncorellated energetic disorder gives a quantitative description on the dependence of the diffusion length to both the energetic disorder strength and temperature. We demonstrate how traps and energetic disorder can pin down the diffusion length in conjugated polymers to values below 10 nm.

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VL - 7722

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M1 - 772214

T2 - Organic Photonics IV, April 12, 2009 - April 15, 2009

Y2 - 1 January 2010

ER -

Modelling exciton diffusion in disordered conjugated polymers

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