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Phonons spreading from laser-heated gold nanoparticle array accelerate diffusion of excitons in an underlying polythiophene thin film
AS CR, Czech Republic.
AS CR, Czech Republic.
AS CR, Czech Republic.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. AS CR, Czech Republic.
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2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 16, 10562-10570 p.Article in journal (Refereed) Published
Abstract [en]

Localized surface plasmon (LSP) photophysical phenomena occurring in metal nanostructures are often presented as a method to effectively couple light into photovoltaic devices of sub-wavelength-scale thickness. However, the excitation of LSP is also associated with rapid energy dissipation leading to local heating, which affects the excitation energy pathway. We studied a system consisting of a planar gold nanoparticle (AuNP) array deposited at the surface of a semiconducting polymer thin film (P3HT). We observed heat transfer from laser pulse excited AuNPs into the P3HT, which was evidenced as a long-living thermochromic effect on transient optical absorption. By modeling of the ultrafast kinetics of exciton population evolution, we determined that their decay was caused by their mutual annihilation. The decay rate was controlled by a phonon-assisted one-dimensional diffusion mechanism with a diffusion constant of 2.2 nm(2) ps(-1). The transferred heat resulted in an increase of the diffusion constant by a factor of almost 2, compared to the control system of P3HT without AuNPs. These results are of practical use for the design of plasmon-enhanced optoelectronic devices.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2017. Vol. 19, no 16, 10562-10570 p.
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URN: urn:nbn:se:liu:diva-137603DOI: 10.1039/c7cp00286fISI: 000400117700039PubMedID: 28393953OAI: oai:DiVA.org:liu-137603DiVA: diva2:1097368
Note

Funding Agencies|Ministry of Education, Youth and Sports of the Czech Republic [POLYMAT LO1507]; European Union (COST Action) [MP1202]; Grant Agency of the Czech Republic [GA15-05095S]; [LD14011]

Available from: 2017-05-22 Created: 2017-05-22 Last updated: 2017-05-22

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CiteExportLink to record
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Citation style
  • apa
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