Photoelectrochemical behavior of hierarchically structured Si/WO 3 core-shell tandem photoanodes

Robert H. Coridan, Kevin A. Arpin, Bruce S. Brunschwig, Paul V. Braun, Nathan S Lewis

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

WO3 thin films have been deposited in a hierarchically structured core-shell morphology, with the cores consisting of an array of Si microwires and the shells consisting of a controlled morphology WO3 layer. Porosity was introduced into the WO3 outer shell by using a self-assembled microsphere colloidal crystal as a mask during the deposition of the WO3 shell. Compared to conformal, unstructured WO3 shells on Si microwires, the hierarchically structured core-shell photoanodes exhibited enhanced near-visible spectral response behavior, due to increased light absorption and reduced distances over which photogenerated carriers were collected. The use of structured substrates also improved the growth rate of microsphere-based colloidal crystals and suggests strategies for the use of colloidal materials in large-scale applications.

Original languageEnglish
Pages (from-to)2310-2317
Number of pages8
JournalNano Letters
Volume14
Issue number5
DOIs
Publication statusPublished - May 14 2014

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Microspheres
Crystals
Light absorption
Masks
Porosity
electromagnetic absorption
spectral sensitivity
Thin films
crystals
Substrates
masks
porosity
thin films

Keywords

  • core-shell semiconductor
  • hierarchical structuring
  • Photoelectrochemical energy conversion
  • silicon
  • tandem semiconductor devices

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Photoelectrochemical behavior of hierarchically structured Si/WO 3 core-shell tandem photoanodes. / Coridan, Robert H.; Arpin, Kevin A.; Brunschwig, Bruce S.; Braun, Paul V.; Lewis, Nathan S.

In: Nano Letters, Vol. 14, No. 5, 14.05.2014, p. 2310-2317.

Research output: Contribution to journalArticle

Coridan, Robert H. ; Arpin, Kevin A. ; Brunschwig, Bruce S. ; Braun, Paul V. ; Lewis, Nathan S. / Photoelectrochemical behavior of hierarchically structured Si/WO 3 core-shell tandem photoanodes. In: Nano Letters. 2014 ; Vol. 14, No. 5. pp. 2310-2317.
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