Growth mode and self-organization of LuPc2 on Si(001)-2 x 1 vicinal surfaces: An optical investigation

被引:8
作者
Boudet, S. [1 ]
Bidermane, I. [1 ,2 ]
Lacaze, E. [1 ]
Gallas, B. [1 ]
Bouvet, M. [3 ]
Brunet, J. [4 ,5 ]
Pauly, A. [4 ,5 ]
Borensztein, Y. [1 ]
Witkowski, N. [1 ]
机构
[1] Univ Paris 06, CNRS, UMR 7588, Inst Nanosci Paris, F-75005 Paris, France
[2] Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden
[3] Univ Bourgogne, CNRS, ICMUB, UMR 6302, F-21078 Dijon, France
[4] CNRS, UMR 6602, Inst Pascal, F-63171 Aubiere, France
[5] Univ Clermont Ferrand, Univ Clermont Ferrand 2, Inst Pascal, F-63000 Clermont Ferrand, France
来源
PHYSICAL REVIEW B | 2012年 / 86卷 / 11期
关键词
SCANNING-TUNNELING-MICROSCOPY; FIELD-EFFECT TRANSISTORS; THIN-FILMS; PHTHALOCYANINE FILMS; ELECTRONIC-STRUCTURE; ANISOTROPY SPECTROSCOPY; SEMICONDUCTOR SURFACES; COPPER-PHTHALOCYANINE; ELECTRICAL-PROPERTIES; METAL;
D O I
10.1103/PhysRevB.86.115413
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report an investigation of the initial growth and of the self-organization of lutetium biphthalocyanine LuPc2 on Si(001)-2 x 1 vicinal surfaces. Using surface-sensitive optical spectroscopies, namely, surface-difference-reflectance spectroscopy (SDRS) and reflectance-anisotropy spectroscopy (RAS), together with local-probe microscopies, we are able to propose a scenario for the growth mode up to about 20 nm. We demonstrate that the growth mode initially proceeds through the formation of a wetting layer, followed by the formation of clusters whose sizes increase while keeping a constant shape in which the molecules are inclined. Moreover, the LuPc2 molecules are self-organized along the step edges, and we are able to estimate that about 30% to 100% of the molecules are aligned when considering that the molecules are tilted by 45 degrees to 63 degrees with respect to the surface normal.
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页数:8
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