Department of Engineering and Physics, Karlstad University, SE-651 88 Karlstad, Sweden.
J Chem Phys. 2019 Jan 28;150(4):044709. doi: 10.1063/1.5070120.
Perylene tetracarboxylic diimide molecules were evaporated onto a Sn/Si(111)-23×23 surface and studied using scanning tunneling microscopy (STM) and low energy electron diffraction. At low coverages, single molecules are locked into specific adsorption geometries, which are investigated in detail using high resolution STM. The electronic structure of these individual molecules was studied using bias dependent STM images. The molecules form 1D rows that become more common with increasing coverages. Possible intermolecular O⋯H interactions within the rows have been identified. At around half of a monolayer (ML), the rows of molecules interact with each other and form a commensurate 43×23 reconstruction. In a complete monolayer, several structures emerge as molecules fill in the space between the 43×23 stripes. Possible intermolecular interactions within the 1 ML structures have been discussed. At coverages above 1 ML, the growth is characterized by island growth, where the molecules are arranged according to the canted structure within the layers.
并五苯四羧酸二酰亚胺分子被蒸发到 Sn/Si(111)-23×23 表面上，并使用扫描隧道显微镜（STM）和低能电子衍射进行研究。在低覆盖率下，单个分子被锁定在特定的吸附几何形状中，使用高分辨率 STM 对其进行了详细研究。使用偏压依赖的 STM 图像研究了这些单个分子的电子结构。这些分子形成 1D 排，随着覆盖率的增加变得更加常见。已经确定了行内可能的分子间 O⋯H 相互作用。在大约半单层（ML）时，分子行相互作用并形成一个共形的 43×23 重构。在完整的单层中，随着分子填充 43×23 条纹之间的空间，出现了几种结构。讨论了 1 ML 结构内可能的分子间相互作用。在高于 1 ML 的覆盖度下，生长的特征是岛状生长，其中分子根据层内的倾斜结构排列。
