Role of surface electronic structure in thin film molecular ordering.
Role of surface electronic structure in thin film molecular ordering.
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DOI：
10.1103/physrevlett.95.256106
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发表时间：
2005-12
影响因子：
8.6
通讯作者：
G. Thayer;J. Sadowski;F. Meyer Zu Heringdorf;T. Sakurai;R. Tromp
中科院分区：
文献类型：
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作者：
G. Thayer;J. Sadowski;F. Meyer Zu Heringdorf;T. Sakurai;R. Tromp
我们表明，并五苯分子的取向是由它们所沉积的表面的电子结构控制的。我们认为表面上态的近费米能级密度控制着衬底与并五烯π轨道的相互作用。与贵金属相比，在半金属Bi（001）和Si(111)(5 x 2)Au表面实现了这种密度的降低，导致并五苯直立。有趣的是，在Bi（001）上生长的并五苯是高度有序的，产生了迄今为止观察到的第一个垂直取向的外延并五苯薄膜。
We show that the orientation of pentacene molecules is controlled by the electronic structure of the surface on which they are deposited. We suggest that the near-Fermi level density of states above the surface controls the interaction of the substrate with the pentacene pi orbitals. A reduction of this density as compared to noble metals, realized in semimetallic Bi(001) and Si(111)(5 x 2)Au surfaces, results in pentacene standing up. Interestingly, pentacene grown on Bi(001) is highly ordered, yielding the first vertically oriented epitaxial pentacene thin films observed to date.