کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5425726 | 1395864 | 2007 | 8 صفحه PDF | دانلود رایگان |

We have investigated the origin of “atomically flat” and “single-crystalline” growth of Bi films on Si(1 1 1)-7 Ã 7 through comparative experiments using Si(1 1 1)-β-â3 Ã â3-Bi as a control system. On the Si(1 1 1)-7 Ã 7 substrate, the majority of initial nuclei stabilize with pseudocubic (PC) paired layers analogous to the black phosphorus (BP) structure, and grow in a strong two-dimensional fashion that results in a “textured” but “atomically flat” surface morphology. After the coalescence of the BP-like grains at a nominal thickness of 4 monolayers (ML), a tiny number of minority hexagonal (HEX) bulk crystal nuclei, aligned commensurately with the substrate 7 Ã 7 lattice, cause the “textured” BP-like PC film to transform into a “single-crystalline” bulk-like HEX film. On the Si(1 1 1)-β-â3 Ã â3-Bi substrate, however, the BP-like structure breaks up into a conventional bulk-like PC structure and the HEX nucleation is suppressed up to as thick as â¼6 ML. Therefore, the morphology and crystallinity of the films are simply rough and polycrystalline, respectively.
Journal: Surface Science - Volume 601, Issue 17, 1 September 2007, Pages 3593-3600