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Title: The Influence of Structure and Processing on the Behavior of TiO2 Protective Layers for Stabilization of n-Si/TiO2/Ni Photoanodes for Water Oxidation

Journal Article · · ACS Applied Materials and Interfaces

Light absorbers with moderate band gaps (1–2 eV) are required for high-efficiency solar fuels devices, but most semiconducting photoanodes undergo photocorrosion or passivation in aqueous solution. Amorphous TiO2 deposited by atomic-layer deposition (ALD) onto various n-type emiconductors (Si,GaAs, GaP, and CdTe) and coated with thin films or islands of Ni produces efficient, stable photoanodes for water oxidation, with the TiO2 films protecting the underlying semiconductor from photocorrosion in pH = 14 KOH(aq). The links between the electronic properties of the TiO2 in these electrodes and the structure and energetic defect states of the material are not yet well-elucidated. We show herein that TiO2 films with a variety of crystal structures and mid-gap defect state distributions, deposited using both ALD and sputtering, form rectifying junctions with n-Si and are highly conductive towards photogenerated carriers in n-Si/TiO2/Ni photoanodes. Moreover, the photovoltage of these electrodes can be modified by annealing the TiO2 in reducing or oxidizing environments. All of the polycrystalline TiO2 films with compact grain boundaries investigated herein protected the n-Si photoanodes against photocorrosion in pH = 14 KOH(aq). Hence, in these devices conduction through the TiO2 layer is neither specific to a particular amorphous or crystalline structure nor determined wholly by a particular extrinsic dopant impurity. The coupled structural and energetic properties of TiO2, and potentially other protective oxides, can therefore be controlled to yield optimized photoelectrode performance.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0004993
OSTI ID:
1634111
Journal Information:
ACS Applied Materials and Interfaces, Vol. 7, Issue 28; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 101 works
Citation information provided by
Web of Science

References (35)

Powering the planet: Chemical challenges in solar energy utilization journal October 2006
Solar Water Splitting Cells journal November 2010
Modeling, simulation, and design criteria for photoelectrochemical water-splitting systems journal January 2012
A Monolithic Photovoltaic-Photoelectrochemical Device for Hydrogen Production via Water Splitting journal April 1998
Electrochemical Photolysis of Water at a Semiconductor Electrode journal July 1972
Light-Induced Water Splitting with Hematite: Improved Nanostructure and Iridium Oxide Catalysis journal July 2010
Atomic layer-deposited tunnel oxide stabilizes silicon photoanodes for water oxidation journal June 2011
Effects of catalyst material and atomic layer deposited TiO2 oxide thickness on the water oxidation performance of metal–insulator–silicon anodes journal January 2013
Photoelectrochemical Behavior of n-type Si(100) Electrodes Coated with Thin Films of Manganese Oxide Grown by Atomic Layer Deposition journal March 2013
High-Performance Silicon Photoanodes Passivated with Ultrathin Nickel Films for Water Oxidation journal November 2013
Protection of p + -n-Si Photoanodes by Sputter-Deposited Ir/IrO x Thin Films journal May 2014
Amorphous TiO2 coatings stabilize Si, GaAs, and GaP photoanodes for efficient water oxidation journal May 2014
Stabilization of n-cadmium telluride photoanodes for water oxidation to O 2 (g) in aqueous alkaline electrolytes using amorphous TiO 2 films formed by atomic-layer deposition journal January 2014
Improved Stability of Polycrystalline Bismuth Vanadate Photoanodes by Use of Dual-Layer Thin TiO 2 /Ni Coatings journal August 2014
Efficient and Sustained Photoelectrochemical Water Oxidation by Cobalt Oxide/Silicon Photoanodes with Nanotextured Interfaces journal April 2014
Stable Solar-Driven Water Oxidation to O 2 (g) by Ni-Oxide-Coated Silicon Photoanodes journal January 2015
Stable solar-driven oxidation of water by semiconducting photoanodes protected by transparent catalytic nickel oxide films journal March 2015
Enhanced Stability and Activity for Water Oxidation in Alkaline Media with Bismuth Vanadate Photoelectrodes Modified with a Cobalt Oxide Catalytic Layer Produced by Atomic Layer Deposition journal November 2013
Oxygen vacancy and hole conduction in amorphous TiO 2 journal January 2015
High-κ gate dielectrics: Current status and materials properties considerations journal May 2001
An investigation of annealing on the dielectric performance of TiO 2 thin films journal September 2006
Titanium dioxide (TiO 2 )-based gate insulators journal May 1999
Effects of interfacial layer growth on the electrical characteristics of thin titanium oxide films on silicon journal May 1999
Thin high-dielectric TiO2 films prepared by low pressure MOCVD journal September 1992
Synchrotron radiation studies of H2O adsorption on TiO2(110) journal August 1989
Insights into Photoexcited Electron Scavenging Processes on TiO 2 Obtained from Studies of the Reaction of O 2 with OH Groups Adsorbed at Electronic Defects on TiO 2 (110) journal January 2003
Raman scattering study on anatase TiO 2 nanocrystals journal March 2000
Adaptive semiconductor/electrocatalyst junctions in water-splitting photoanodes journal December 2013
Nickel–Iron Oxyhydroxide Oxygen-Evolution Electrocatalysts: The Role of Intentional and Incidental Iron Incorporation journal April 2014
Titanium dioxide photocatalysts produced by reactive magnetron sputtering journal May 1995
Alternative Low-Pressure Surface Chemistry of Titanium Tetraisopropoxide on Oxidized Molybdenum journal October 2014
Stabilization of Si microwire arrays for solar-driven H 2 O oxidation to O 2 (g) in 1.0 M KOH(aq) using conformal coatings of amorphous TiO 2 journal January 2015
Defects in Anatase TiO 2 Single Crystal Controlled by Heat Treatments journal March 2004
Energy band alignment at TiO2∕Si interface with various interlayers journal February 2008
Structural and electrical characterization of TiO2 grown from titanium tetrakis-isopropoxide (TTIP) and TTIP/H2O ambients journal May 1996

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Titanium dioxide thin films by atomic layer deposition: a review journal August 2017
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Figures / Tables (9)