Charge control of silicon chemistry

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Science  07 Nov 2014:
Vol. 346, Issue 6210, pp. 713-714
DOI: 10.1126/science.346.6210.713-e

A site on an organic molecule often can be made more or less reactive by changing its neighboring functional groups so that they add or withdraw electronic charge from the site. Piva et al. show a similar effect for the reaction of dangling bond states on a hydrogen-terminated silicon surface with unsaturated organic molecules such as styrene. They modified the electronic properties of the surface by changing the surface concentration of arsenic dopants and used scanning tunneling microscopy to monitor product formation. Negatively charged doubly occupied dangling bonds, which were more prevalent on the highly doped surfaces, were less reactive than neutral singly occupied dangling bonds. These results are consistent with density functional theory calculations and help explain the heterogeneous reactivity of dangling bonds on silicon surfaces.

Phys. Rev. B 90, 155422 (2014).

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