Understanding and control of the epitaxial multilayer growth of aromatic molecules on single crystalline metal substrates

研究了在杂化界面提供弱或强相互作用的金属表面上单晶类有机多层膜的外延生长。特别是，当含有杂原子的分子形成特定位点的共价键时，Cu（110）表面上的低聚芳烃的生长以扩展的界面状态和第一层的平坦分子取向为特征。相反，对于提供弱相互作用的表面，如Bi（001）和硅烯，既有直立取向，也有平坦取向，并受薄膜晶体各种晶体平面的特定晶格匹配条件的支配。结果提供了一个详细的了解衬底的影响超出广泛研究的第一层在实现外延生长和单轴排列的晶粒。

The epitaxial growth of single-crystalline-like organic multilayer films on selected metal surfaces, chosen to provide either weak or strong interactions at the hybrid interface, has been studied. In particular, while molecules containing heteroatoms form site-specific covalent bonds, the growth of oligoacenes on the Cu(110) surface is characterized by extended interfacial states and a flat molecular orientation in the first layer. On the contrary, for surfaces providing weak interactions like Bi(001) and silicene, both standing and flat orientations occur and are governed by the specific lattice-matching conditions for various crystallographic planes of the thin film crystals. The results provide a detailed understanding of the influence of the substrate beyond the widely studied first layer in achieving epitaxial growth and uniaxial alignment of the grains.