Photoelectrochemistry of core–shell tandem junction n–p^+-Si/n-WO_3 microwire array photoelectrodes
By Matthew Shaner, Katherine T Fountaine, S. Ardo, Robert H. Coridan, Harry A. Atwater, Nathan S. Lewis. 2014
137 citations recorded by the source corpus.
Tandem junction (n–p^+-Si/ITO/WO_3/liquid) core–shell microwire devices for solar-driven water splitting have been designed, fabricated and investigated photoelectrochemically. The tandem devices exhibited open-circuit potentials of E_(∝) = −1.21 V versus E^0′(O_2/H_2O), demonstrating additive voltages across the individual junctions (n–p^+-Si E_(∝) = −0.5 V versus solution; WO_3/liquid E_(∝) = −0.73 V versus E^0′(O_2/H_2O)). Optical concentration (12×, AM1.5D) shifted the open-circuit potential to E_(∝) = −1.27 V versus E^0′(O_2/H_2O) and resulted in unassisted H_2 production during two-electrode measurements (anode: tandem device, cathode: Pt disc). The solar energy-conversion efficiencies were very low, 0.0068% and 0.0019% when the cathode compartment was saturated with Ar or H_2, respectively, due to the non-optimal photovoltage and band-gap of the WO_3 that was used in the demonstration system to obtain stability of all of the system components under common operating conditions while also insuring product separation for safety purposes.
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- Research opportunities to advance solar energy utilization (2016, background): “in novel form factors and geometries, such as arrays of semiconducting microwires in flexible polymeric membranes (96, 97) coupled to earthabundant electrocatalysts, with the system able”