Chemistry Reference
In-Depth Information
5.3 due to the formation of oxide. These results indicate that hydrogen termination has
a much lower steady-state dark limiting current compared to the surface covered by an
oxide.
Interface tunneling from reaction intermediates is another cause for a large
dark limiting current on the silicon electrode. For example, Fig. 5.26 shows that the
limiting current increases with increasing F concentration.
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The effect of fluoride
concentration on the limiting current varies with pH as shown in Fig. 5.27.
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At
pH > 4 the limiting current increases with fluoride concentration from 0.2M and up
with a log-log slope of 0.3. Although the surface of silicon tends to be terminated by
