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Si/TiO_2 Tandem-Junction Microwire Arrays for Unassisted Solar-Driven Water Splitting

Shaner, Matthew R. and McDowell, Matthew T. and Pien, Alex and Atwater, Harry A. and Lewis, Nathan S. (2016) Si/TiO_2 Tandem-Junction Microwire Arrays for Unassisted Solar-Driven Water Splitting. Journal of the Electrochemical Society, 163 (5). H261-H264. ISSN 0013-4651. doi:10.1149/2.0141605jes.

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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 (TiO_2). 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^−/O_2), a current density at E = E^(0′)(OH^−/O_2) of 0.78 mA cm^(−2), a fill factor ( ff ) = 0.51, and a photovoltaic-biased photoelectrochemical ideal regenerative cell efficiency of 0.6%.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemSupplemental Material
Shaner, Matthew R.0000-0003-4682-9757
McDowell, Matthew T.0000-0001-5552-3456
Atwater, Harry A.0000-0001-9435-0201
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2016 The Electrochemical Society. Manuscript submitted October 23, 2015; revised manuscript received December 17, 2015. Published January 15, 2016. 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.
Group:Resnick Sustainability Institute, JCAP
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Resnick Sustainability InstituteUNSPECIFIED
Subject Keywords:Photoelectrochemistry Silicon Tandem Junction Water splitting
Issue or Number:5
Record Number:CaltechAUTHORS:20160301-075443518
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Official Citation:Si/TiO2 Tandem-Junction Microwire Arrays for Unassisted Solar-Driven Water Splitting J. Electrochem. Soc. 2016 163(5): H261-H264; doi:10.1149/2.0141605jes
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64889
Deposited By: Ruth Sustaita
Deposited On:01 Mar 2016 23:28
Last Modified:10 Nov 2021 23:36

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