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Photoanodic behavior of vapor-liquid-solid–grown, lightly doped, crystalline Si microwire arrays

Santori, Elizabeth A. and Maiolo, James R., III and Bierman, Matthew J. and Strandwitz, Nicholas C. and Kelzenberg, Michael D. and Brunschwig, Bruce S. and Atwater, Harry A. and Lewis, Nathan S. (2012) Photoanodic behavior of vapor-liquid-solid–grown, lightly doped, crystalline Si microwire arrays. Energy and Environmental Science, 5 (5). pp. 6867-6871. ISSN 1754-5692. doi:10.1039/c2ee03468a.

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Arrays of n-Si microwires have to date exhibited low efficiencies when measured as photoanodes in contact with a 1-1′-dimethylferrocene (Me_2Fc^(+/0))–CH_3OH solution. Using high-purity Au or Cu catalysts, arrays of crystalline Si microwires were grown by a vapor-liquid-solid process without dopants, which produced wires with electronically active dopant concentrations of 1 × 10^(13) cm^(−3). When measured as photoanodes in contact with a Me_2Fc^(+/0)–CH_3OH solution, the lightly doped Si microwire arrays exhibited greatly increased fill factors and efficiencies as compared to n-Si microwires grown previously with a lower purity Au catalyst. In particular, the Cu-catalyzed Si microwire array photoanodes exhibited open-circuit voltages of ~0.44 V, carrier-collection efficiencies exceeding ~0.75, and an energy-conversion efficiency of 1.4% under simulated air mass 1.5 G illumination. Lightly doped Cu-catalyzed Si microwire array photoanodes have thus demonstrated performance that is comparable to that of optimally doped p-type Si microwire array photocathodes in photoelectrochemical cells.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kelzenberg, Michael D.0000-0002-6249-2827
Brunschwig, Bruce S.0000-0002-6135-6727
Atwater, Harry A.0000-0001-9435-0201
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2012 Royal Society of Chemistry. Received 15th December 2011, Accepted 14th February 2012. First published on the web 20 Feb 2012. We acknowledge BP, the Gordon and Betty Moore Foundation, Toyota, and the U.S. Department of Energy for financial support. NCS acknowledges the NSF for an American Competitiveness in Chemistry postdoctoral fellowship (CHE-1042006). The angle-resolved optical characterization work was supported by the US Department of Energy ‘Light–Material Interactions in Energy Conversion’ Energy Frontier Research Center Award (grant DESC0001293). We acknowledge critical support and infrastructure provided for this work by the Kavli Nanoscience Institute at Caltech.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
NSF Postdoctoral FellowshipCHE-1042006
Department of Energy (DOE)DE-SC0001293
Kavli Nanoscience InstituteUNSPECIFIED
Issue or Number:5
Record Number:CaltechAUTHORS:20120521-102643994
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Official Citation:Photoanodic behavior of vapor-liquid-solid–grown, lightly doped, crystalline Si microwire arrays Elizabeth A. Santori, James R. Maiolo III, Matthew J. Bierman, Nicholas C. Strandwitz, Michael D. Kelzenberg, Bruce S. Brunschwig, Harry A. Atwater and Nathan S. Lewis Energy Environ. Sci., 2012, 5, 6867-6871 DOI: 10.1039/C2EE03468A
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31567
Deposited By: Ruth Sustaita
Deposited On:21 May 2012 18:30
Last Modified:09 Nov 2021 19:55

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