Itis remarkable that such an important macroscopic feature of the etching process is actually dueto the geometrical restrictions imposed by the indirect second neighbours on the terminationprobability of dangling bonds by hydroxyl groups.In conclusion, the anisotropy of wet chemical etching at the macroscopic scale is explainedby two mechanisms at the atomistic scale: the weakening of backbonds following OH termi-nation of surface atoms and the existence of significant interaction between the terminating Hatoms and OH groups. However, C7 and C8 cannot be linked to A by the corresponding firstneighbours, because they are missing. Rev. Vote: 1 2 3 4 5 Download Ebooks 2010 All Download Ebooks ebooks are the property of their respective owners. People get confused about the differences between silicon, silicate, silica and even silicone. The effects of specific OH-coverages arediscussed in detail in .We have carried out electronic-structure calculations in order to clarify how bond weaken-ing occurs and how the indirect second neighbours affect the removal of surface atoms.
Burghartz IBM T. Be sure to use your company e-mail when you create or update your profile. In this letter, we show how subtle features of themicroscopic reaction environment lead to dramatic changes in the macroscopic etching pat-terns. Reece et al. Atoms arerelaxed to minimize total energy and atomic forces using a conjugate gradient algorithm.To model the hydrogen/hydroxylcovered silicon surface we consider an H-terminated Si18cluster with adsorbed hydroxyl groups at various different sites, as shown in fig. and Nieminen R. Petersson 1,2, H.
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