Exciton annihilation and diffusion in semiconducting polymers

P. E. Shaw; A. J. Lewis; A. Ruseckas; I. D. W. Samuel

doi:10.1117/12.681573

Exciton annihilation and diffusion in semiconducting polymers

P. E. Shaw, A. J. Lewis, A. Ruseckas, I. D. W. Samuel

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We show that time-resolved luminescence measurements at high excitation densities can be used to study exciton annihilation and diffusion, and report the results of such measurements on films of P3HT and MEH-PPV. The results fit to an exciton-exciton annihilation model with a time independent annihilation rate gamma, which was measured to be gamma = (2.8 +/- 0.5)x10(-8) cm(3)s(-1) in MEH-PPV and gamma = (5.2 +/- 1)x10(-10) cm(3)s(-3) in P3HT. This implies much faster diffusion in MEH-PPV. Assuming a value of 1 nm for the annihilation radius we evaluated the diffusion length for pristine P3HT in one direction to be 3.2 nm. Annealing of P3HT was found to increase the annihilation rate to (1.1 +/- 0.2)x10(-9) cm(3)s(-1) and the diffusion length to 4.7 nm.

Original language	English
Title of host publication	Organic Photovoltaics VII
Editors	ZH Kafafi, PA Lane
Place of Publication	BELLINGHAM
Publisher	SPIE
Pages	U63-U70
Number of pages	8
ISBN (Print)	978-0-8194-6413-2
DOIs	https://doi.org/10.1117/12.681573
Publication status	Published - 2006
Event	Conference on Organic Photovoltaics VII - San Diego Duration: 15 Aug 2006 → 17 Aug 2006

Conference

Conference	Conference on Organic Photovoltaics VII
City	San Diego
Period	15/08/06 → 17/08/06

Access to Document

10.1117/12.681573

Cite this

@inproceedings{7756ecfbad024802936e301c9df7eebb,

title = "Exciton annihilation and diffusion in semiconducting polymers",

abstract = "We show that time-resolved luminescence measurements at high excitation densities can be used to study exciton annihilation and diffusion, and report the results of such measurements on films of P3HT and MEH-PPV. The results fit to an exciton-exciton annihilation model with a time independent annihilation rate gamma, which was measured to be gamma = (2.8 +/- 0.5)x10(-8) cm(3)s(-1) in MEH-PPV and gamma = (5.2 +/- 1)x10(-10) cm(3)s(-3) in P3HT. This implies much faster diffusion in MEH-PPV. Assuming a value of 1 nm for the annihilation radius we evaluated the diffusion length for pristine P3HT in one direction to be 3.2 nm. Annealing of P3HT was found to increase the annihilation rate to (1.1 +/- 0.2)x10(-9) cm(3)s(-1) and the diffusion length to 4.7 nm.",

author = "Shaw, {P. E.} and Lewis, {A. J.} and A. Ruseckas and Samuel, {I. D. W.}",

year = "2006",

doi = "10.1117/12.681573",

language = "English",

isbn = "978-0-8194-6413-2",

pages = "U63--U70",

editor = "ZH Kafafi and PA Lane",

booktitle = "Organic Photovoltaics VII",

publisher = "SPIE",

address = "United States",

note = "Conference on Organic Photovoltaics VII ; Conference date: 15-08-2006 Through 17-08-2006",

}

TY - GEN

T1 - Exciton annihilation and diffusion in semiconducting polymers

AU - Shaw, P. E.

AU - Lewis, A. J.

AU - Ruseckas, A.

AU - Samuel, I. D. W.

PY - 2006

Y1 - 2006

N2 - We show that time-resolved luminescence measurements at high excitation densities can be used to study exciton annihilation and diffusion, and report the results of such measurements on films of P3HT and MEH-PPV. The results fit to an exciton-exciton annihilation model with a time independent annihilation rate gamma, which was measured to be gamma = (2.8 +/- 0.5)x10(-8) cm(3)s(-1) in MEH-PPV and gamma = (5.2 +/- 1)x10(-10) cm(3)s(-3) in P3HT. This implies much faster diffusion in MEH-PPV. Assuming a value of 1 nm for the annihilation radius we evaluated the diffusion length for pristine P3HT in one direction to be 3.2 nm. Annealing of P3HT was found to increase the annihilation rate to (1.1 +/- 0.2)x10(-9) cm(3)s(-1) and the diffusion length to 4.7 nm.

AB - We show that time-resolved luminescence measurements at high excitation densities can be used to study exciton annihilation and diffusion, and report the results of such measurements on films of P3HT and MEH-PPV. The results fit to an exciton-exciton annihilation model with a time independent annihilation rate gamma, which was measured to be gamma = (2.8 +/- 0.5)x10(-8) cm(3)s(-1) in MEH-PPV and gamma = (5.2 +/- 1)x10(-10) cm(3)s(-3) in P3HT. This implies much faster diffusion in MEH-PPV. Assuming a value of 1 nm for the annihilation radius we evaluated the diffusion length for pristine P3HT in one direction to be 3.2 nm. Annealing of P3HT was found to increase the annihilation rate to (1.1 +/- 0.2)x10(-9) cm(3)s(-1) and the diffusion length to 4.7 nm.

U2 - 10.1117/12.681573

DO - 10.1117/12.681573

M3 - Conference contribution

SN - 978-0-8194-6413-2

SP - U63-U70

BT - Organic Photovoltaics VII

A2 - Kafafi, ZH

A2 - Lane, PA

PB - SPIE

CY - BELLINGHAM

T2 - Conference on Organic Photovoltaics VII

Y2 - 15 August 2006 through 17 August 2006

ER -

Exciton annihilation and diffusion in semiconducting polymers

Abstract

Conference

Access to Document

Fingerprint

Cite this