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A Comparison of the Behavior of Single Crystalline and Nanowire Array ZnO Photoanodes

Fitch, Anthony and Strandwitz, Nicholas C. and Brunschwig, Bruce S. and Lewis, Nathan S. (2013) A Comparison of the Behavior of Single Crystalline and Nanowire Array ZnO Photoanodes. Journal of Physical Chemistry C, 117 (5). pp. 2008-2015. ISSN 1932-7447. doi:10.1021/jp3098457.

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The photoelectrochemical behavior of n-type ZnO nanowire arrays was compared to the behavior of single crystalline n-ZnO photoelectrodes in contact with either 0.50 M K_(2)SO_4(aq) at pH 6.0 or Fe(CN)_(4)^(3–/4–)(aq). The use of a thin film of ZnO as a seed layer produced dense nanowire arrays in which the ZnO nanowires were preferentially oriented perpendicular to the substrate. The average diameter of the ZnO nanowires that were produced by two different growth conditions was ~125 and ~175 nm, respectively, with a nanowire length of 2–4 μm. Under simulated 1 Sun Air Mass 1.5 illumination conditions, the ZnO nanowire arrays exhibited open-circuit potentials, E_oc, and short-circuit photocurrent densities, J_sc, that were very close to the values observed from single crystal n-type ZnO photoanodes in contact with these same electrolytes. Device physics simulations were in accord with the experimentally observed behavior, indicating that, under certain combinations of materials properties and interface recombination velocities, the use of nanostructured light absorbers can provide an approach to efficient photoelectrochemical solar energy-conversion systems.

Item Type:Article
Related URLs:
URLURL TypeDescription
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2013 American Chemical Society. Received: October 4, 2012; Revised: December 10, 2012; Published: December 14, 2012. This work was supported by the Department of Energy, Office of Basic Energy Sciences, DE-FG02-07ER46405. N.C.S. acknowledges the NSF for an American Competitiveness in Chemistry postdoctoral fellowship (CHE-1042006).
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-07ER46405
NSF Postdoctoral FellowshipCHE-1042006
Issue or Number:5
Record Number:CaltechAUTHORS:20130319-115517593
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Official Citation:A Comparison of the Behavior of Single Crystalline and Nanowire Array ZnO Photoanodes Anthony Fitch, Nicholas C. Strandwitz, Bruce S. Brunschwig, and Nathan S. Lewis The Journal of Physical Chemistry C 2013 117 (5), 2008-2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37565
Deposited On:19 Mar 2013 21:13
Last Modified:09 Nov 2021 23:29

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