Control of in-plane orientation of phthalocyanine molecular columns using vicinal Si(001)-(2×1)-H
Control of in-plane orientation of phthalocyanine molecular columns using vicinal Si(001)-(2×1)-H
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利用邻位 Si(001)-(2×1)-H 控制酞菁分子柱的面内取向
DOI：
10.1063/1.1373700
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发表时间：
2001
影响因子：
3.2
通讯作者：
H. Tokumoto
中科院分区：
文献类型：
--
作者：
M. Nakamura;T. Matsunobe;H. Tokumoto
以邻位Si（001）-（2×1）-H为衬底，采用有机分子束外延技术成功地控制了酞菁铜（CuPc）薄膜的面内晶向，薄膜中含有约4 nm周期的原子台阶。在60 °C下生长连续膜，并且膜厚度在5至8个分子层之间。 通过观察膜的摩擦力图像，发现90%的分子列跨衬底台阶行对齐。这种择优取向被认为是由人工表面晶格引起的，人工表面晶格是由刚性CuPc晶体与阶梯状表面之间的条纹有效接触面积引起的。薄膜的各向异性光学性能也已被证实由偏振反射测量。
In-plane crystal orientation of copper phthalocyanine (CuPc) films formed by organic molecular-beam epitaxy have been successfully controlled by using vicinal Si(001)-(2×1)-H as a substrate, containing atomic steps of an approximately 4 nm period. A continuous film was grown at 60 °C and the film thickness ranged between 5 and 8 molecular layers. By observing a frictional force image of the film, 90% of the molecular columns were found to align across the substrate step rows. The preferential orientation is considered to be induced by artificial surface lattices, which result from the striped effective contact area between the rigid CuPc crystals and the stair-like surfaces. The anisotropic optical properties of the film have been also confirmed by polarized reflection measurements.