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The Initial Phase of Photoelectrochemical Anodization of Si in Alkaline Media Investigated by Synchrotron Radiation Photoelectron Spectroscopy (SRPES) and Scanning Probe Microscopy (SPM)

Published online by Cambridge University Press:  30 September 2013

M. Letilly ,
K. Skorupska ,
M. Aggour ,
M. Kanis  and
H.-J. Lewerenz
M. Letilly
Affiliation:
Helmholtz-Zentrum Berlin, Solar Fuel and Energy Storage Materials, Hahn-Meitner Platz 1, 14109 Berlin, Germany Joint Center for Artificial Photosynthesis, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA
K. Skorupska
Affiliation:
Helmholtz-Zentrum Berlin, Solar Fuel and Energy Storage Materials, Hahn-Meitner Platz 1, 14109 Berlin, Germany Brandenburg Technical University Cottbus, Platz der Deutschen Einheit 1, 03046 Cottbus, Germany
M. Aggour
Affiliation:
Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco
M. Kanis
Affiliation:
Helmholtz-Zentrum Berlin, Solar Fuel and Energy Storage Materials, Hahn-Meitner Platz 1, 14109 Berlin, Germany
H.-J. Lewerenz
Affiliation:
Helmholtz-Zentrum Berlin, Solar Fuel and Energy Storage Materials, Hahn-Meitner Platz 1, 14109 Berlin, Germany Joint Center for Artificial Photosynthesis, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA
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Abstract

Anodic oxide formation and chemical and electrochemical etching of n-Si(111) have been investigated in alkaline media. Due to the complexity of the processes, the investigation has been restricted to the initial phase where a transitory anodic photocurrent peak is observed slightly positive from the open circuit potential (ocp). In-system photoelectron spectroscopy, performed at the U 49/2 beamline at Bessy, shows sub-monolayer silicon surface oxidation and remnant H-termination, indicating island-type oxide formation. Scanning probe microscopy shows the formation of macropores with 300-500 nm diameter and an average depth of 5-8 nm. The discussion comprises chemical and electrochemical dissolution mechanisms and routes to development of nanoemitter fuel generating devices.

Keywords

Siphotochemicalscanning probe microscopy (SPM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1539: Symposium D – From Molecules to Materials—Pathways to Artificial Photosynthesis , 2013 , mrss13-1539-d04-06
Copyright
Copyright © Materials Research Society 2013 

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