Growth, characterization, and electrochemical properties of doped n-Type KTaO3 photoanodes

I. E. Paulauskas, J. E. Katz, G. E. Jellison, Nathan S Lewis, L. A. Boatner, G. M. Brown

Research output: Contribution to journalArticle

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Abstract

The effects of compositionally induced changes on the semiconducting properties, optical response, chemical stability, and overall performance of KTaO3 photoanodes in photoelectrochemical (PEC) cells have been investigated. Single crystals of n-type Ca- and Ba-doped KTaO3 with carrier concentrations ranging from 0.45 to 11.5 × 1019 cm -3 were grown and characterized as photoanodes in basic aqueous electrolyte PEC cells. The PEC properties of the crystals, including the photocurrent, photovoltage, and flatband potential in contact with 8.5 M NaOH(aq) were relatively independent of whether Ca or Ba was used to produce the semiconducting form of KTaO3. All of the Ca- or Ba-doped KTaO 3 single-crystal photoanodes were chemically stable in the electrolyte and, based on the open-circuit potential and the band-edge positions, were capable of unassisted photochemical H2 and O 2 evolution from H2O. The minority-carrier diffusion lengths values were small and comparable to the depletion region width. Photoanodic currents were only observed for photoanode illumination with light above the bandgap (i.e., λ3 -based photoanode materials.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume156
Issue number5
DOIs
Publication statusPublished - 2009

Fingerprint

Photoelectrochemical cells
Electrochemical properties
Electrolytes
Single crystals
electrolytes
single crystals
Chemical stability
photovoltages
diffusion length
minority carriers
cells
Photocurrents
Carrier concentration
photocurrents
depletion
Energy gap
Optical properties
Lighting
illumination
optical properties

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Growth, characterization, and electrochemical properties of doped n-Type KTaO3 photoanodes. / Paulauskas, I. E.; Katz, J. E.; Jellison, G. E.; Lewis, Nathan S; Boatner, L. A.; Brown, G. M.

In: Journal of the Electrochemical Society, Vol. 156, No. 5, 2009.

Research output: Contribution to journalArticle

Paulauskas, I. E. ; Katz, J. E. ; Jellison, G. E. ; Lewis, Nathan S ; Boatner, L. A. ; Brown, G. M. / Growth, characterization, and electrochemical properties of doped n-Type KTaO3 photoanodes. In: Journal of the Electrochemical Society. 2009 ; Vol. 156, No. 5.
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