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Journal of Materials Science

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12-07-2016 | Original Paper

Effects of gold nanorods on the excited-state dynamics and photovoltaic performances of hybrid nanocomposites containing poly(3-hexylthiophene)

Authors: Dongki Lee, Sugyeong Jeong, Jung-Hwa Park, Soo Young Park, Du-Jeon Jang

Published in: Journal of Materials Science | Issue 21/2016

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Abstract

Poly(3-hexylthiophene)-stabilized gold nanorods (Au-NR@P3HT nanocomposites) have been facilely fabricated by incubating Au nanorods (NRs) with thiol-terminated P3HT to investigate the effects of Au NRs on the excited-state dynamics and photovoltaic performances of P3HT. The S₁ decay of Au-NR@P3HT nanocomposites is found to be slower than that of pristine P3HT, suggesting that the stretched-strand conformation of P3HT chains attached to Au NRs makes structural relaxation more difficult. The amplitude of T₁ absorption is much smaller in Au-NR@P3HT nanocomposites than in pristine P3HT, indicating that the intersystem crossing of S₁ excitons into T₁ excitons does not occur efficiently in Au-NR@P3HT nanocomposites due to the nonflexible character of aggregated P3HT chains. From the comparison of the performances of organic photovoltaic devices, we have found that the device with the 3 % embedding of Au-NR@P3HT nanocomposites into the P3HT matrix of the active layer shows significantly improved photovoltaic performances (27 % enhancement in the power conversion efficiency), suggesting that the surface-plasmon resonances of Au NRs enhance the dissociation as well as the generation of excitons highly.

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Title: Effects of gold nanorods on the excited-state dynamics and photovoltaic performances of hybrid nanocomposites containing poly(3-hexylthiophene)
Authors: Dongki Lee
Sugyeong Jeong
Jung-Hwa Park
Soo Young Park
Du-Jeon Jang
Publication date: 12-07-2016
Publisher: Springer US
Published in: Journal of Materials Science / Issue 21/2016
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-016-0200-5

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