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Initial Phase of Photoelectrochemical Conditioning of Silicon in Alkaline Media: Surface Chemistry and Topography

Letilly, Marika and Skorupska, Katarzyna and Lewerenz, Hans-Joachim (2013) Initial Phase of Photoelectrochemical Conditioning of Silicon in Alkaline Media: Surface Chemistry and Topography. Journal of Physical Chemistry C, 117 (32). pp. 16381-16391. ISSN 1932-7447. https://resolver.caltech.edu/CaltechAUTHORS:20130906-091022940

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Abstract

Oxidation and dissolution phenomena of Si(111) in alkaline electrolyte are investigated by a combination of photoelectrochemistry, scanning probe microscopy (SPM), transmission electron microscopy (TEM) and in-system synchrotron radiation photoelectron spectroscopy (SRPES). The surface topography in the initial anodic potential regime shows the formation of mesoscale pores with widths in the range 300–500 nm and partial surface oxidation. The surface chemistry assessment by SRPES shows patchy silicon oxide growth, suboxides, and remnants of the former hydrogen terminated surface areas. The use of the obtained self-organized nanostructures for application in nanoemitter photocatalytic solar cells is discussed. The necessary requirements regarding the total surface area of electrocatalysts needed to sustain the current density due to light-induced excess minority carriers in conjunction with the exchange current density of the considered heterogeneous catalysts is discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/jp401853p DOIArticle
http://pubs.acs.org/doi/abs/10.1021/jp401853pPublisherArticle
ORCID:
AuthorORCID
Lewerenz, Hans-Joachim0000-0001-8433-9471
Additional Information:© 2013 American Chemical Society. Received: February 22, 2013; Revised: July 7, 2013; Published: July 16, 2013. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, as follows: Part of the electrochemical experiments were supported though the Office of Science of the U.S. Department of Energy under Award No. DE-SC0004993; the SRPES and ERDA measurements and the AFM and TEM images were supported by the Deutsche Forschungsgemeinschaft-DFG under Award No. LE 1192/4-1/2. The authors are grateful to M. Kanis and H. Jungblut for contributing to the SRPES experiments, to M. Aggour for his help regarding electrochemical measurements, to U. Bloeck for recording of the TEM images, and to F. Munnik and K. Saravanan for performing the ERDA measurements. M.L. is grateful for financial support of the DFG (Award No. LE 1192/4-1/2).
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Deutsche Forschungsgemeinschaft (DFG)LE 1192/4-1/2
Issue or Number:32
Record Number:CaltechAUTHORS:20130906-091022940
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130906-091022940
Official Citation:Initial Phase of Photoelectrochemical Conditioning of Silicon in Alkaline Media: Surface Chemistry and Topography Marika Letilly, Katarzyna Skorupska, and Hans-Joachim Lewerenz The Journal of Physical Chemistry C 2013 117 (32), 16381-16391
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41137
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Sep 2013 21:44
Last Modified:08 Oct 2019 22:16

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