分子線エピタキシによる面創成に関する研究(第2報) : 基板面方位とSi-Siホモエピタキシャル成長機構の関係

概要

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Silicon (Si) substrates of five different kinds of crystai orientations are epitaxially grown to 10- 120nm in thickness by a Si molecular beam epitaxy under a same growih temperature of 800℃. These epitaxially grown surfaces were observed at each grown thickness by the help of AFM interprocessly, thus their surface formation processes were clarified as follows, In the cases of(lOO) and (1lO) substrates, first, many micro nuclei, 20-50nm in height, were generated, secondly; they were gradually combined together, and fmally, the ridge ofthem became smoother. In the cases of (113) and (331) substrates, the formation and combination processes of nuclei were also observed, however, further deposited molecules could not fill the spaces among the nuclei completely . In the case of (lll) substrate, most of adsorbed molecules were caught at arbitrary atomic steps and contributed to extend the length of their terraces. The further growth made some steps piled, so that, higher steps and wider terraces were gradually generated, l-5nm in height and 200 - 400nm in width. These surface formation processes can be explained, to some extent, hom the surface energy level, namely, the higher energy tends to result in the higher nucleation density.
公益社団法人精密工学会の論文
2001-02-05