期刊
NANO LETTERS
卷 14, 期 5, 页码 2310-2317出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl404623t
关键词
Photoelectrochemical energy conversion; hierarchical structuring; silicon; core-shell semiconductor; tandem semiconductor devices
类别
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001293]
- National Science Foundation [OCI-1053575]
- Molecular Materials Research Center of the Beckman Institute at the California Institute of Technology
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.
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