6 research outputs found
Photoelectrochemical Behavior of Hierarchically Structured Si/WO_3 Core–Shell Tandem Photoanodes
WO_3 thin films have been deposited in a hierarchically structured core–shell morphology, with the cores consisting of an array of Si microwires and the shells consisting of a controlled morphology WO_3 layer. Porosity was introduced into the WO_3 outer shell by using a self-assembled microsphere colloidal crystal as a mask during the deposition of the WO_3 shell. Compared to conformal, unstructured WO_3 shells on Si microwires, the hierarchically structured core–shell photoanodes exhibited enhanced near-visible spectral response behavior, due to increased light absorption and reduced distances over which photogenerated carriers were collected. The use of structured substrates also improved the growth rate of microsphere-based colloidal crystals and suggests strategies for the use of colloidal materials in large-scale applications
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Photoelectrochemical Behavior of Hierarchically Structured Si/WO<sub>3</sub> Core–Shell Tandem Photoanodes
WO<sub>3</sub> thin films have been
deposited in a hierarchically
structured core–shell morphology, with the cores consisting
of an array of Si microwires and the shells consisting of a controlled
morphology WO<sub>3</sub> layer. Porosity was introduced into the
WO<sub>3</sub> outer shell by using a self-assembled microsphere colloidal
crystal as a mask during the deposition of the WO<sub>3</sub> shell.
Compared to conformal, unstructured WO<sub>3</sub> shells on Si microwires,
the hierarchically structured core–shell photoanodes exhibited
enhanced near-visible spectral response behavior, due to increased
light absorption and reduced distances over which photogenerated carriers
were collected. The use of structured substrates also improved the
growth rate of microsphere-based colloidal crystals and suggests strategies
for the use of colloidal materials in large-scale applications