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

16 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

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

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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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