Photoelectrochemical Behavior of Hierarchically Structured Si/WO_3 Core–Shell Tandem Photoanodes
Abstract
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.
Additional Information
© 2014 American Chemical Society. Received: December 13, 2013; Revised: March 10, 2014. Publication Date (Web): March 28, 2014. This work is part of the "Light−Material Interactions in Energy Conversion" Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award DE-SC0001293. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant OCI-1053575, and the Molecular Materials Research Center of the Beckman Institute at the California Institute of Technology. A detailed description of the materials, synthetic methods, and characterization/simulation protocols of plain and porous core−shell microwires; SEM micrographs of the large-scale infiltration of the microwire array by colloids and large-area porous core−shell templating; fractional absorption-depth profiles from FDTD simulations.Attached Files
Supplemental Material - nl404623t_si_001.pdf
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Additional details
- Alternative title
- Photoelectrochemical Behavior of Hierarchically Structured Si/WO3 Core–Shell Tandem Photoanodes
- Eprint ID
- 45238
- Resolver ID
- CaltechAUTHORS:20140428-091112366
- DE-SC0001293
- Department of Energy (DOE)
- OCI-1053575
- NSF
- Caltech Beckman Institute
- Created
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2014-04-28Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Kavli Nanoscience Institute