Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation

Ashish Bansal, Nathan S Lewis

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

A two-step chlorination/alkylation method was used to introduce -CnH2n+1 (n = 1-6) functionality onto single-crystal, (111)-oriented, n-type Si surfaces. H-terminated Si photoanodes were unstable under illumination in contact with an aqueous 0.35 M K4Fe(CN)6-0.05 M K3Fe(CN)6 electrolyte. Such electrodes displayed low open-circuit voltages and exhibited a pronounced time-dependent deterioration in their current density vs potential characteristics due to anodic oxidation. In contrast, Si surfaces functionalized with -CH3 and -C2H5 groups displayed significant improvements in stability while displaying excellent electrochemical properties when used as photoelectrodes in the aqueous Fe(CN)63-/4- electrolyte.

Original languageEnglish
Pages (from-to)4058-4060
Number of pages3
JournalJournal of Physical Chemistry B
Volume102
Issue number21
Publication statusPublished - May 21 1998

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alkylation
Alkylation
Electrolytes
Stabilization
stabilization
electrolytes
chlorination
Chlorination
Anodic oxidation
Open circuit voltage
open circuit voltage
Electrochemical properties
deterioration
low voltage
Deterioration
Current density
Lighting
illumination
Single crystals
current density

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation. / Bansal, Ashish; Lewis, Nathan S.

In: Journal of Physical Chemistry B, Vol. 102, No. 21, 21.05.1998, p. 4058-4060.

Research output: Contribution to journalArticle

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