Journal
ELECTROCHEMICAL AND SOLID STATE LETTERS
Volume 8, Issue 5, Pages A247-A249Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1887196
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The Hybrid Photoelectrode, a multi-junction thin film device for producing hydrogen through solar-powered water-splitting, is presented. In this monolithically stacked device configuration, an outer semiconductor-electrolyte junction acts in conjunction with underlying photovoltaic solid state-junctions to generate sufficient photovoltage and photocurrent for unassisted water photoelectrolysis. An initial prototype device, consisting of an amorphous-silicon-based photovoltaic tandem junction coated with a reactively sputtered tungsten trioxide film, exhibited stable solar-to-hydrogen (STH) conversion in acidic media at 0.6% efficiency. An efficiency of 2.2% STH is projected for a device based on recently developed tungsten trioxide films and existing thin-film-silicon tandem devices. The potential for further efficiency increase by materials and device optimizations is discussed. (C) 2005 The Electrochemical Society.
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