Two-dimensional metal-dielectric hybrid-structured film with titanium oxide for enhanced visible light absorption and photo-catalytic application

Joonmo Park, Hee Jun Kim, SangHyeon Nam, Hyowook Kim, Hak Jong Choi, Youn Jeong Jang, Jae Sung Lee, Jonghwa Shin, Heon Lee, Jeong Min Baik

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Two-dimensional design based on ultrathin TiO2 film for enhanced visible light absorption and photo-catalytic applications is reported, which mainly consists of three layers of gold film, TiO2 film, and gold nanoparticles (Au NPs). The Au and TiO2 films are produced by e-beam evaporation and atomic layer deposition, respectively, in a carefully controlled way to minimize surface roughness. As compared with bare TiO2 film, the Au NPs/TiO2/Au film significantly increased the photoactivity over the entire UV and visible wavelength range. The Au film increases the light absorption in the UV region with TiO2 acting as an impedance-matching layer, while the Au NPs increase the light absorption in the visible region due to the plasmonic resonance effects, increasing the photocurrent under visible light. 3D numerical simulation results suggest that the Au film also plays an important role in enhancing the electrical field intensity at the TiO2 film in contact with Au NPs, by efficient excitation of localized surface plasmon resonances, thereby, contributing to the enhanced photoactivity of the film in the visible range. This simple system may serve as an efficient platform for solar energy conversion utilizing the whole UV-visible range of solar spectrum based on two-dimensional plasmonic photoelectrodes.

Original languageEnglish
Pages (from-to)115-122
Number of pages8
JournalNano Energy
Volume21
DOIs
Publication statusPublished - 2016 Mar 1

Keywords

  • 2-dimensional design
  • Photocatalyst
  • TiO
  • Visible light absorption
  • Water-splitting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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