Abstract
WO3 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 WO3 layer. Porosity was introduced into the WO3 outer shell by using a self-assembled microsphere colloidal crystal as a mask during the deposition of the WO3 shell. Compared to conformal, unstructured WO3 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.
Original language | English (US) |
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Pages (from-to) | 2310-2317 |
Number of pages | 8 |
Journal | Nano letters |
Volume | 14 |
Issue number | 5 |
DOIs | |
State | Published - May 14 2014 |
Keywords
- core-shell semiconductor
- hierarchical structuring
- Photoelectrochemical energy conversion
- silicon
- tandem semiconductor devices
ASJC Scopus subject areas
- Condensed Matter Physics
- Bioengineering
- General Chemistry
- General Materials Science
- Mechanical Engineering