کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5425726 1395864 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Origin of flat morphology and high crystallinity of ultrathin bismuth films
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Origin of flat morphology and high crystallinity of ultrathin bismuth films
چکیده انگلیسی

We have investigated the origin of “atomically flat” and “single-crystalline” growth of Bi films on Si(1 1 1)-7 × 7 through comparative experiments using Si(1 1 1)-β-√3 × √3-Bi as a control system. On the Si(1 1 1)-7 × 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 × 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-√3 × √3-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 ∼6 ML. Therefore, the morphology and crystallinity of the films are simply rough and polycrystalline, respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 601, Issue 17, 1 September 2007, Pages 3593-3600
نویسندگان
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