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Journal of Photonics for Energy • Open Access

Enhancement of plasmon-induced charge separation efficiency by coupling silver nanocubes with a thin gold film
Author(s): Kazutaka Akiyoshi; Koichiro Saito; Tetsu Tatsuma

Paper Abstract

Plasmon-induced charge separation (PICS), in which an energetic electron is injected from a plasmonic nanoparticle (NP) to a semiconductor on contact, is often inhibited by a protecting agent adsorbed on the NP. We addressed this issue for an Ag nanocube-TiO2 system by coating it with a thin Au layer or by inserting the Au layer between the nanocubes (NCs) and TiO2. Both of the electrodes exhibit much higher photocurrents due to PICS than the electrodes without the Au film or the Ag NCs. These photocurrent enhancements can be explained in terms of PICS with accelerated electron transfer, in which electron injection from the Ag NCs or Ag@Au core-shell NCs to TiO2 is promoted by the Au film, or PICS enhanced by a nanoantenna effect, in which the electron injection from the Au film to TiO2 is enhanced by optical near field generated by the Ag NC.

Paper Details

Date Published: 9 August 2016
PDF: 6 pages
J. Photon. Energy 6(4) 042505 doi: 10.1117/1.JPE.6.042505
Published in: Journal of Photonics for Energy Volume 6, Issue 4
Show Author Affiliations
Kazutaka Akiyoshi, The Univ. of Tokyo (Japan)
Koichiro Saito, The Univ. of Tokyo (Japan)
Tetsu Tatsuma, The Univ. of Tokyo (Japan)

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