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Title: Silicon Microwire Arrays for Solar Energy-Conversion Applications

Abstract

Highly structured silicon microwire (Si MW) arrays have been synthesized and characterized as absorbers for solar energy-conversion systems. These materials are of great interest for applications in solar energy conversion, including solar electricity and solar fuels production, due to their unique materials properties, form factors, ease of fabrication, and device processing attributes. The Si MW array geometry allows for efficient collection of photogenerated carriers from impure materials that have short minority-carrier diffusion lengths, while simultaneously allowing for high optical absorption and high external quantum yields for charge carrier collection. In addition, Si MW arrays exhibit unique mesoscale optical behavior and can be removed from the growth substrate to provide flexible, processable arrays of Si microwires ordered in a variety of organic polymers and ionomers. The unique photon management properties of Si MW arrays, combined with their high internal surface area and controlled morphology for catalyst placement and support, allow for the use of earth-abundant electrocatalysts to produce an integrated, functional photoelectrode. Furthermore, these materials therefore also provide an opportunity to explore the 3-dimensional photoelectrochemical behavior of fuel-forming microstructured electrodes.

Authors:
 [1];  [1];  [1]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1634125
Grant/Contract Number:  
SC0004993; FG02-03-ER15483
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 118; Journal Issue: 2; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; catalysts; wires; silicon; absorption; materials

Citation Formats

Warren, Emily L., Atwater, Harry A., and Lewis, Nathan S. Silicon Microwire Arrays for Solar Energy-Conversion Applications. United States: N. p., 2013. Web. doi:10.1021/jp406280x.
Warren, Emily L., Atwater, Harry A., & Lewis, Nathan S. Silicon Microwire Arrays for Solar Energy-Conversion Applications. United States. doi:10.1021/jp406280x.
Warren, Emily L., Atwater, Harry A., and Lewis, Nathan S. Mon . "Silicon Microwire Arrays for Solar Energy-Conversion Applications". United States. doi:10.1021/jp406280x. https://www.osti.gov/servlets/purl/1634125.
@article{osti_1634125,
title = {Silicon Microwire Arrays for Solar Energy-Conversion Applications},
author = {Warren, Emily L. and Atwater, Harry A. and Lewis, Nathan S.},
abstractNote = {Highly structured silicon microwire (Si MW) arrays have been synthesized and characterized as absorbers for solar energy-conversion systems. These materials are of great interest for applications in solar energy conversion, including solar electricity and solar fuels production, due to their unique materials properties, form factors, ease of fabrication, and device processing attributes. The Si MW array geometry allows for efficient collection of photogenerated carriers from impure materials that have short minority-carrier diffusion lengths, while simultaneously allowing for high optical absorption and high external quantum yields for charge carrier collection. In addition, Si MW arrays exhibit unique mesoscale optical behavior and can be removed from the growth substrate to provide flexible, processable arrays of Si microwires ordered in a variety of organic polymers and ionomers. The unique photon management properties of Si MW arrays, combined with their high internal surface area and controlled morphology for catalyst placement and support, allow for the use of earth-abundant electrocatalysts to produce an integrated, functional photoelectrode. Furthermore, these materials therefore also provide an opportunity to explore the 3-dimensional photoelectrochemical behavior of fuel-forming microstructured electrodes.},
doi = {10.1021/jp406280x},
journal = {Journal of Physical Chemistry. C},
issn = {1932-7447},
number = 2,
volume = 118,
place = {United States},
year = {2013},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 55 works
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