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

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


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 (EOC) of -1.5 V vs the formal potential for oxygen evolution, E0/(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 languageEnglish
Pages (from-to)H261-H264
JournalJournal of the Electrochemical Society
Issue number5
Publication statusPublished - 2016

ASJC Scopus subject areas

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

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