Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation

Ashish Bansal, Nathan S Lewis

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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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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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