Electrochemical properties of (111)-oriented n-Si surfaces derivatized with covalently-attached alkyl chains

Ashish Bansal, Nathan S Lewis

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The electrochemical properties of alkyl-terminated, (111)-oriented, n-type Si surfaces, prepared via a two-step halogenation/alkylation procedure, were analyzed in contact with CH3OH-1,1′-dimethylferrocene+/0 (Me2Fc+/0) solutions. Current density-potential and differential capacitance-potential measurements of these surfaces in contact with CH3OH-Me2Fc+/0 indicated that the electrochemical properties of the alkyl-terminated surfaces were very similar to those of the H-terminated Si surface. The alkyl overlayers did not shift the Si band edges or induce significant surface recombination, but they did provide an additional electrical series resistance to charge transfer across the Si/liquid interface. The efficacy of alkyl overlayers in preventing photooxidation and photocorrosion of n-silicon surfaces was measured in contact with CH3OH-Me2Fc+/0 solutions to which a known amount of water had been added. Under these conditions, the alkyl-terminated surfaces consistently showed excellent current density-potential characteristics and displayed lower oxidation rates than the H-terminated surface, indicating that stability toward oxidation had been achieved without any significant compromise in the electrochemical qualities of the silicon surface.

Original languageEnglish
JournalJournal of Physical Chemistry B
Volume102
Issue number7
Publication statusPublished - Feb 12 1998

Fingerprint

Electrochemical properties
Silicon
Current density
Halogenation
halogenation
current density
Oxidation
oxidation
Photooxidation
photooxidation
alkylation
Alkylation
silicon
Contacts (fluid mechanics)
Charge transfer
Capacitance
capacitance
charge transfer
Water
shift

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Electrochemical properties of (111)-oriented n-Si surfaces derivatized with covalently-attached alkyl chains. / Bansal, Ashish; Lewis, Nathan S.

In: Journal of Physical Chemistry B, Vol. 102, No. 7, 12.02.1998.

Research output: Contribution to journalArticle

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abstract = "The electrochemical properties of alkyl-terminated, (111)-oriented, n-type Si surfaces, prepared via a two-step halogenation/alkylation procedure, were analyzed in contact with CH3OH-1,1′-dimethylferrocene+/0 (Me2Fc+/0) solutions. Current density-potential and differential capacitance-potential measurements of these surfaces in contact with CH3OH-Me2Fc+/0 indicated that the electrochemical properties of the alkyl-terminated surfaces were very similar to those of the H-terminated Si surface. The alkyl overlayers did not shift the Si band edges or induce significant surface recombination, but they did provide an additional electrical series resistance to charge transfer across the Si/liquid interface. The efficacy of alkyl overlayers in preventing photooxidation and photocorrosion of n-silicon surfaces was measured in contact with CH3OH-Me2Fc+/0 solutions to which a known amount of water had been added. Under these conditions, the alkyl-terminated surfaces consistently showed excellent current density-potential characteristics and displayed lower oxidation rates than the H-terminated surface, indicating that stability toward oxidation had been achieved without any significant compromise in the electrochemical qualities of the silicon surface.",
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N2 - The electrochemical properties of alkyl-terminated, (111)-oriented, n-type Si surfaces, prepared via a two-step halogenation/alkylation procedure, were analyzed in contact with CH3OH-1,1′-dimethylferrocene+/0 (Me2Fc+/0) solutions. Current density-potential and differential capacitance-potential measurements of these surfaces in contact with CH3OH-Me2Fc+/0 indicated that the electrochemical properties of the alkyl-terminated surfaces were very similar to those of the H-terminated Si surface. The alkyl overlayers did not shift the Si band edges or induce significant surface recombination, but they did provide an additional electrical series resistance to charge transfer across the Si/liquid interface. The efficacy of alkyl overlayers in preventing photooxidation and photocorrosion of n-silicon surfaces was measured in contact with CH3OH-Me2Fc+/0 solutions to which a known amount of water had been added. Under these conditions, the alkyl-terminated surfaces consistently showed excellent current density-potential characteristics and displayed lower oxidation rates than the H-terminated surface, indicating that stability toward oxidation had been achieved without any significant compromise in the electrochemical qualities of the silicon surface.

AB - The electrochemical properties of alkyl-terminated, (111)-oriented, n-type Si surfaces, prepared via a two-step halogenation/alkylation procedure, were analyzed in contact with CH3OH-1,1′-dimethylferrocene+/0 (Me2Fc+/0) solutions. Current density-potential and differential capacitance-potential measurements of these surfaces in contact with CH3OH-Me2Fc+/0 indicated that the electrochemical properties of the alkyl-terminated surfaces were very similar to those of the H-terminated Si surface. The alkyl overlayers did not shift the Si band edges or induce significant surface recombination, but they did provide an additional electrical series resistance to charge transfer across the Si/liquid interface. The efficacy of alkyl overlayers in preventing photooxidation and photocorrosion of n-silicon surfaces was measured in contact with CH3OH-Me2Fc+/0 solutions to which a known amount of water had been added. Under these conditions, the alkyl-terminated surfaces consistently showed excellent current density-potential characteristics and displayed lower oxidation rates than the H-terminated surface, indicating that stability toward oxidation had been achieved without any significant compromise in the electrochemical qualities of the silicon surface.

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