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Comparison between the electrical junction properties of H-terminated and methyl-terminated individual Si microwire/polymer assemblies for photoelectrochemical fuel production

Yahyaie, Iman and Ardo, Shane and Oliver, Derek R. and Thomson, Douglas J. and Freund, Michael S. and Lewis, Nathan S. (2012) Comparison between the electrical junction properties of H-terminated and methyl-terminated individual Si microwire/polymer assemblies for photoelectrochemical fuel production. Energy and Environmental Science, 5 (12). pp. 9789-9794. ISSN 1754-5692. doi:10.1039/c2ee23115h.

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The photoelectrical properties and stability of individual p-silicon (Si) microwire/polyethylenedioxythiophene/polystyrene sulfonate:Nafion/n-Si microwire structures, designed for use as arrays for solar fuel production, were investigated for both H-terminated and CH_3-terminated Si microwires. Using a tungsten probe method, the resistances of individual wires, as well as between individual wires and the conducting polymer, were measured vs. time. For the H-terminated samples, the n-Si/polymer contacts were initially rectifying, whereas p-Si microwire/polymer contacts were initially ohmic, but the resistance of both the n-Si and p-Si microwire/polymer contacts increased over time. In contrast, relatively stable, ohmic behavior was observed at the junctions between CH_3-terminated p-Si microwires and conducting polymers. CH_3-terminated n-Si microwire/polymer junctions demonstrated strongly rectifying behavior, attributable to the work function mismatch between the Si and polymer. Hence, a balance must be found between the improved stability of the junction electrical properties achieved by passivation, and the detrimental impact on the effective resistance associated with the additional rectification at CH_3-terminated n-Si microwire/polymer junctions. Nevertheless, the current system under study would produce a resistance drop of ~20 mV during operation under 100 mW cm^(−2) of Air Mass 1.5 illumination with high quantum yields for photocurrent production in a water-splitting device.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Ardo, Shane0000-0001-7162-6826
Freund, Michael S.0000-0003-1104-2292
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2012 The Royal Society of Chemistry. Received 8th August 2012, Accepted 24th September 2012. First published on the web 25 Sep 2012. Financial support from the Natural Sciences and Engineering Research Council (NSERC) of Canada, the Canada Foundation for Innovation (CFI), the Manitoba Research and Innovation Fund, and the University of Manitoba is gratefully acknowledged. The work reported made use of surface characterization infrastructure in the Manitoba Institute for Materials. This work was supported by a National Science Foundation (NSF) Center for Chemical Innovation (CCI) Powering the Planet (grants CHE-0802907, CHE-0947829, and NSF-ACCF) and made use of the Molecular Materials Research Center of the Beckman Institute at Caltech and the Kavli Nanoscience Institute at Caltech. This research was undertaken, in part, thanks to funding from the Canada Research Chairs Program. S. A. acknowledges partial support from a U. S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE) Postdoctoral Research Award under the EERE Fuel Cell Technologies Program.
Group:CCI Solar Fuels, Kavli Nanoscience Institute
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Manitoba Research and Innovation FundUNSPECIFIED
University of ManitobaUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Issue or Number:12
Record Number:CaltechAUTHORS:20130107-103859564
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36198
Deposited By: Tony Diaz
Deposited On:07 Jan 2013 23:05
Last Modified:09 Nov 2021 23:20

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