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Photoelectrochemical Behavior of n‑Type Si(111) Electrodes Coated With a Single Layer of Graphene

Nielander, Adam C. and Bierman, Matthew J. and Petrone, Nicholas and Strandwitz, Nicholas C. and Ardo, Shane and Yang, Fan and Hone, James and Lewis, Nathan S. (2013) Photoelectrochemical Behavior of n‑Type Si(111) Electrodes Coated With a Single Layer of Graphene. Journal of the American Chemical Society . ISSN 0002-7863. https://resolver.caltech.edu/CaltechAUTHORS:20131113-084041726

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Abstract

The behavior of graphene-coated n-type Si(111) photoanodes was compared to the behavior of H-terminated n-type Si(111) photoanodes in contact with aqueous K_3[Fe(CN)_6]/K_4[Fe(CN)_6] as well as in contact with a series of outer-sphere, one-electron redox couples in nonaqueous electrolytes. The n-Si/Graphene electrodes exhibited stable short-circuit photocurrent densities of over 10 mA cm^(–2) for >1000 s of continuous operation in aqueous electrolytes, whereas n-Si–H electrodes yielded a nearly complete decay of the current density within 100 s. The values of the open-circuit photovoltages and the flat-band potentials of the Si were a function of both the Fermi level of the graphene and the electrochemical potential of the electrolyte solution, indicating that the n-Si/Graphene did not form a buried junction with respect to the solution contact.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ja407462gDOIArticle
http://pubs.acs.org/doi/abs/10.1021/ja407462gPublisherArticle
ORCID:
AuthorORCID
Nielander, Adam C.0000-0002-3639-2427
Ardo, Shane0000-0001-7162-6826
Hone, James0000-0002-8084-3301
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2013 American Chemical Society. Received: July 20, 2013. Just Accepted Manuscript October 14, 2013. N.S.L. and A.C.N. acknowledge the NSF, Grant CHE-1214152, for support and the Beckman Institute Molecular Materials Resource Center for facilities. A.C.N. acknowledges support from the Dept. of Defense through the National Defense Science & Engineering Graduate Fellowship Program. S.A. acknowledges support from a U.S. Dept. of Energy, Office of Energy Efficiency and Renewable Energy (EERE) Postdoctoral Research Award under EERE Fuel Cell Technologies Program. N.P. and J.H. acknowledge the Center for Re-Defining Photovoltaic Efficiency Through Molecular-Scale Control, an Energy Frontier Research Center funded by the U.S. Dept. of Energy, Office of Science, Office of Basic Energy Sciences under Award DE-SC0001085.
Funders:
Funding AgencyGrant Number
NSFCHE-1214152
Caltech Beckman InstituteUNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
EERE Fuel Cell Technologies ProgramUNSPECIFIED
Department of Energy (DOE)DE-SC0001085
Record Number:CaltechAUTHORS:20131113-084041726
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131113-084041726
Official Citation:Photoelectrochemical Behavior of n-Type Si(111) Electrodes Coated With a Single Layer of Graphene Adam C. Nielander, Matthew J. Bierman, Nicholas Petrone, Nicholas C. Strandwitz, Shane Ardo, Fan Yang, James Hone, and Nathan S. Lewis Journal of the American Chemical Society Article ASAP
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42409
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Nov 2013 21:47
Last Modified:09 Oct 2019 04:26

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