- Tan, T.Y. and Lee, S.T. and Gosele, U., A model for growth directional features in silicon nanowires,
Appl. Phys. A, Mater. Sci. Process. (Germany), vol. A74 no. 3
pp. 423 - 32 [s003390101133] .
(last updated on 2007/04/10)
Long silicon nanowires (SiNWs) grown by laser ablation or by thermal evaporation of monoxide source materials are primarily oriented in the (112) direction, and some in the (110) direction, but rarely in the (100) or (111) directions. We propose a model to explain these SiNW growth directional features. The model consists of two parts. Part one is concerned with mechanism-based criteria and part two with applying these criteria to explain the experimental results. Four criteria are considered: (i) the stability of a Si atom occupying a surface site; (ii) the Si 111 surface stability in the presence of oxygen; (iii) the stepped Si 111 surface layer lateral growth process; and (iv) the effect of dislocations in providing perpetuating 111 steps to facilitate SiNW growth. Analyses of SiNW growth in accordance with these criteria showed that (112) and (110) are the preferred SiNW growth directions, and that (111) and (100) are not
dislocations;elemental semiconductors;nanostructured materials;pulsed laser deposition;silicon;surface topography;vacuum deposition;