Si/TiO2 tandem-junction microwire arrays for unassisted solar-driven water splitting

Matthew R. Shaner; Matthew T. McDowell; Alex Pien; Harry A. Atwater; Nathan S Lewis

doi:10.1149/2.0141605jes

Si/TiO₂ tandem-junction microwire arrays for unassisted solar-driven water splitting

Matthew R. Shaner, Matthew T. McDowell, Alex Pien, Harry A. Atwater, Nathan S Lewis

California Institute of Technology

Research output: Contribution to journal › Article

15 Citations (Scopus)

Abstract

Tandem-junction microwire array photoelectrodes have been fabricated by coating np⁺-Si radial homojunction microwire arrays sequentially with fluorine-doped tin oxide (FTO) and titanium dioxide (TiO₂). These photoelectrodes effected unassisted water splitting under simulated 1 Sun conditions with an open-circuit potential (E_OC) of -1.5 V vs the formal potential for oxygen evolution, E^0/(OH^-/O₂), a current density at E = E ⁰'(OH-/O₂) of 0.78 mA cm^-2, a fill factor (ff) = 0.51, and a photovoltaic-biased photoelectrochemical ideal regenerative cell efficiency of 0.6%.

Original language	English
Pages (from-to)	H261-H264
Journal	Journal of the Electrochemical Society
Volume	163
Issue number	5
DOIs	https://doi.org/10.1149/2.0141605jes
Publication status	Published - 2016

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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

Shaner, M. R., McDowell, M. T., Pien, A., Atwater, H. A., & Lewis, N. S. (2016). Si/TiO₂ tandem-junction microwire arrays for unassisted solar-driven water splitting. Journal of the Electrochemical Society, 163(5), H261-H264. https://doi.org/10.1149/2.0141605jes

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10.1149/2.0141605jes