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• W4387246033 abstract "The transfer of photogenerated charges through interfaces in heterojunction photoanodes is a key process that controls the efficiency of solar water splitting. Considering Co3O4/SiOx/Si photoanodes prepared by physical vapor deposition as a representative case study, it is shown that defects normally present in the native SiOx layer dramatically affect the onset of the photocurrent. Electron paramagnetic resonance indicates that the signal of defects located in dangling bonds of trivalent Si atoms at the Si/SiOx interface vanishes upon vacuum annealing at 850 °C. Correspondingly, the photovoltage of the photoanode increases to ≈500 mV. Similar results are obtained for NiO/SiOx/Si photoanodes. Photoelectrochemical analysis and impedance spectroscopy (in solution and in the solid state) indicate how the defect annealing modifies the Co3O4/SiOx/Si junction. This work shows that defect annealing at the solid-solid interface in composite photoanodes strongly improves the efficiency of charge transfer through interfaces, which is the basis for effective solar-to-chemical energy conversion." @default.
• W4387246033 created "2023-10-03" @default.
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• W4387246033 date "2023-10-02" @default.
• W4387246033 modified "2023-10-16" @default.
• W4387246033 title "Effect of Interfacial SiO_<i>x</i> Defects on the Functional Properties of Si-Transition Metal Oxide Photoanodes for Water Splitting" @default.
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• W4387246033 doi "https://doi.org/10.1021/acsami.3c09555" @default.
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