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Photoelectrochemical Behavior of Hierarchically Structured Si/WO_3 Core–Shell Tandem Photoanodes

Coridan, Robert H. and Arpin, Kevin A. and Brunschwig, Bruce S. and Braun, Paul V. and Lewis, Nathan S. (2014) Photoelectrochemical Behavior of Hierarchically Structured Si/WO_3 Core–Shell Tandem Photoanodes. Nano Letters, 14 (5). pp. 2310-2317. ISSN 1530-6984.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Coridan, Robert H.0000-0003-1916-4446
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Alternate Title:Photoelectrochemical Behavior of Hierarchically Structured Si/WO3 Core–Shell Tandem Photoanodes
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.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001293
Caltech Beckman InstituteUNSPECIFIED
Subject Keywords:Photoelectrochemical energy conversion; hierarchical structuring; silicon; core−shell semiconductor; tandem semiconductor devices
Issue or Number:5
Record Number:CaltechAUTHORS:20140428-091112366
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Official Citation:Photoelectrochemical Behavior of Hierarchically Structured Si/WO3 Core–Shell Tandem Photoanodes Robert H. Coridan, Kevin A. Arpin, Bruce S. Brunschwig, Paul V. Braun, and Nathan S. Lewis Nano Letters 2014 14 (5), 2310-2317
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45238
Deposited By: Tony Diaz
Deposited On:28 Apr 2014 19:28
Last Modified:03 Oct 2019 06:28

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