A comparison of the behavior of single crystalline and nanowire array ZnO photoanodes

Anthony Fitch, Nicholas C. Strandwitz, Bruce S. Brunschwig, Nathan S Lewis

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The photoelectrochemical behavior of n-type ZnO nanowire arrays was compared to the behavior of single crystalline n-ZnO photoelectrodes in contact with either 0.50 M K2SO4(aq) at pH 6.0 or Fe(CN) 4 3-/4-(aq). The use of a thin film of ZnO as a seed layer produced dense nanowire arrays in which the ZnO nanowires were preferentially oriented perpendicular to the substrate. The average diameter of the ZnO nanowires that were produced by two different growth conditions was ∼125 and ∼175 nm, respectively, with a nanowire length of ∼2-4 μm. Under simulated 1 Sun Air Mass 1.5 illumination conditions, the ZnO nanowire arrays exhibited open-circuit potentials, Eoc, and short-circuit photocurrent densities, Jsc, that were very close to the values observed from single crystal n-type ZnO photoanodes in contact with these same electrolytes. Device physics simulations were in accord with the experimentally observed behavior, indicating that, under certain combinations of materials properties and interface recombination velocities, the use of nanostructured light absorbers can provide an approach to efficient photoelectrochemical solar energy-conversion systems.

Original languageEnglish
Pages (from-to)2008-2015
Number of pages8
JournalJournal of Physical Chemistry C
Volume117
Issue number5
DOIs
Publication statusPublished - Feb 7 2013

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Nanowires
nanowires
Crystalline materials
solar energy conversion
air masses
short circuits
Photocurrents
Energy conversion
Short circuit currents
Sun
Solar energy
Electrolytes
photocurrents
Seed
seeds
absorbers
Materials properties
sun
Physics
Lighting

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

A comparison of the behavior of single crystalline and nanowire array ZnO photoanodes. / Fitch, Anthony; Strandwitz, Nicholas C.; Brunschwig, Bruce S.; Lewis, Nathan S.

In: Journal of Physical Chemistry C, Vol. 117, No. 5, 07.02.2013, p. 2008-2015.

Research output: Contribution to journalArticle

Fitch, Anthony ; Strandwitz, Nicholas C. ; Brunschwig, Bruce S. ; Lewis, Nathan S. / A comparison of the behavior of single crystalline and nanowire array ZnO photoanodes. In: Journal of Physical Chemistry C. 2013 ; Vol. 117, No. 5. pp. 2008-2015.
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