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 › peer-review

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

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

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@article{7c97e8d623fd412f81f0d51b51078f6c,

title = "Si/TiO2 tandem-junction microwire arrays for unassisted solar-driven water splitting",

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 (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%.",

author = "Shaner, {Matthew R.} and McDowell, {Matthew T.} and Alex Pien and Atwater, {Harry A.} and Lewis, {Nathan S.}",

note = "Funding Information: The authors acknowledge Stefan Omelchenko for assistance with the XRD measurements, John Lloyd for discussions about the cTLM measurements and Dr. Shawn Chatman for providing the Xe arc lamp spectral irradiance data. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993. M.R.S. acknowledges the Resnick Sustainability Institute for a graduate fellowship.",

year = "2016",

doi = "10.1149/2.0141605jes",

language = "English",

volume = "163",

pages = "H261--H264",

journal = "Journal of the Electrochemical Society",

issn = "0013-4651",

publisher = "Electrochemical Society, Inc.",

number = "5",

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TY - JOUR

T1 - Si/TiO2 tandem-junction microwire arrays for unassisted solar-driven water splitting

AU - Shaner, Matthew R.

AU - McDowell, Matthew T.

AU - Pien, Alex

AU - Atwater, Harry A.

AU - Lewis, Nathan S.

N1 - Funding Information: The authors acknowledge Stefan Omelchenko for assistance with the XRD measurements, John Lloyd for discussions about the cTLM measurements and Dr. Shawn Chatman for providing the Xe arc lamp spectral irradiance data. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993. M.R.S. acknowledges the Resnick Sustainability Institute for a graduate fellowship.

PY - 2016

Y1 - 2016

N2 - 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%.

AB - 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%.

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