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Title: Si/TiO2 Tandem-Junction Microwire Arrays for Unassisted Solar-Driven Water Splitting

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0141605jes· OSTI ID:1633783
 [1];  [1];  [1];  [1];  [1]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
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In this work, 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 ($$E_{\text{oc}}$$) 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 ($$\textit{ff}$$) = 0.51, and a photovoltaic-biased photoelectrochemical ideal regenerative cell efficiency of 0.6%.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0004993
OSTI ID:
1633783
Journal Information:
Journal of the Electrochemical Society, Vol. 163, Issue 5; ISSN 0013-4651
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (13)

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Efficient Solar Water Splitting, Exemplified by RuO 2 -Catalyzed AlGaAs/Si Photoelectrolysis journal September 2000
Comparison of the device physics principles of planar and radial p-n junction nanorod solar cells journal June 2005
Limiting and realizable efficiencies of solar photolysis of water journal August 1985
Merits and limitations of circular TLM structures for contact resistance determination for novel III-V HBTs conference January 2004
Photoelectrochemical Behavior of Planar and Microwire-Array Si|GaP Electrodes journal June 2012
Photoelectrochemistry of core–shell tandem junction n–p + -Si/n-WO 3 microwire array photoelectrodes journal January 2014
Growth of Oriented Single-Crystalline Rutile TiO 2 Nanorods on Transparent Conducting Substrates for Dye-Sensitized Solar Cells journal March 2009

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