Exciton annihilation and diffusion in semiconducting polymers

Shaw, P. E., Lewis, A. J., Ruseckas, A. and Samuel, I. D. W. (2006). Exciton annihilation and diffusion in semiconducting polymers. In: Organic Photovoltaics VII. Conference on Organic Photovoltaics VII, San Diego, CA, United States, (U63-U70). 15-17 August 2006. doi:10.1117/12.681573


Author Shaw, P. E.
Lewis, A. J.
Ruseckas, A.
Samuel, I. D. W.
Title of paper Exciton annihilation and diffusion in semiconducting polymers
Conference name Conference on Organic Photovoltaics VII
Conference location San Diego, CA, United States
Conference dates 15-17 August 2006
Proceedings title Organic Photovoltaics VII   Check publisher's open access policy
Journal name Proceedings of SPIE - The International Society for Optical Engineering   Check publisher's open access policy
Place of Publication Bellingham, WA, United States
Publisher S P I E - International Society for Optical Engineering
Publication Year 2006
Sub-type Fully published paper
DOI 10.1117/12.681573
Open Access Status File (Publisher version)
ISBN 978-0-8194-6413-2
ISSN 0277-786X
1996-756X
Volume 6334
Start page U63
End page U70
Total pages 8
Language eng
Formatted Abstract/Summary
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 γ, which was measured to be γ = (2.8±0.5)×10-8 cm3s-1 in MEH-PPV and γ = (5.2±1)×10-10 cm3s-1 in P3HT. This implies much faster diffusion in MEHPPV. 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)×10-9 cm3s-1 and the diffusion length to 4.7 nm.
Keyword annihilation
diffusion
time-resolved
fluorescence
annealing
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article number 63340G

Document type: Conference Paper
Collection: School of Chemistry and Molecular Biosciences
 
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