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 language | English |
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Pages (from-to) | 4058-4060 |
Number of pages | 3 |
Journal | Journal of Physical Chemistry B |
Volume | 102 |
Issue number | 21 |
DOIs | |
Publication status | Published - May 21 1998 |
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry