Pyramidal Metal–dielectric hybrid-structure geometry with an asymmetric TiO2 layer for broadband light absorption and photocatalytic applications

Hee Jun Kim, Junho Jun, Hak Jong Choi, Hyunah Kwon, Junha Park, Changwon Seo, Jong Kyu Kim, Jonghwa Shin, Jeongyong Kim, Heon Lee, Jeong Min Baik

Research output: Contribution to journalArticle

Abstract

In this study, a pyramidal metal–dielectric hybrid-structure geometry with high broadband light absorption was prepared and applied as a photoelectrode for solar water oxidation. TiO2 was obliquely deposited on the pyramidal Au film, leading to asymmetrically thick pyramids. With the decoration of Au nanoparticles, the light absorption in the entire UV–visible region significantly increased to > 90%, which was examined by three-dimensional finite-difference time-domain simulations and confirmed by confocal spectral mapping techniques. By the introduction of Ti as the insertion layer, the alignment of bands at the TiO2/Au film interface was tuned, thereby promoting the separation of photogenerated carriers via the efficient transport of electrons to the Au film. This transport led to a remarkable enhancement in the photocurrent density (~0.16 mA/cm2) by 3.4 times compared to that observed for a flat TiO2 layer.

Original languageEnglish
Pages (from-to)468-474
Number of pages7
JournalNano Energy
Volume53
DOIs
Publication statusPublished - 2018 Nov 1

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Keywords

  • Asymmetric TiO
  • Broadband light absorption
  • Metal-dielectric hybrid structure
  • Nanoimprinting lithography
  • Photoelectrodes

ASJC Scopus subject areas

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

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